The Unholy Alliance (TV series)

The Unholy Alliance (literally "Alliance") is an action crime-thriller television drama created by Jazz Boon and TVB. Principal photography began in Hong Kong in September 2016, and continued in Taiwan in December 2016. It premiered on TVB Jade on 7 August 2017, and for MediaCorp's Channel U in July 2019, and ran for 28 episodes.

Boon has described The Unholy Alliance as a Mission: Impossible-style action thriller that features modern martial arts, including MMA, Brazilian jiu-jitsu, Krav Maga and gun fu. It stars Nina Paw, Ruco Chan, Nancy Wu, Joel Chan, Elaine Yiu, Kwok Fung, Jimmy Au, KK Cheung, and Elena Kong. The Unholy Alliance follows a modern Hong Kong crime family, led by the matriarch Ling Hung (Paw).

Synopsis
Over 25 years ago, Ling Hung, her mother and her two siblings, Ling Hei and Ling Lit, worked with the triads for money and to keep their lives and their business eventually expanded into a huge empire. Hung also became best friends with Mei, a neighbour also drafted into the triad. Mei realized as the head of the empire, Hung’s life will be in grave danger and, with the assistance of Hung’s personal assistant Mr. Yik, decided to have plastic surgery to make her face identical to Hung’s so that she can replace Hung to the public whilst Hung nurses her injuries. Hung eventually met and fell in love with a man whilst nursing her injuries in Lantau Island and bore his child. However, her lover was tragically killed in a assassination attempt on Hung. Hung’s lover made her promise to keep their future son hidden and away from the triad. Hung entrusted her newborn son to Mei to raise in Taiwan whilst she remains in Hong Kong to continue running her empire. Ling Hung’s son, Ko Tze Kit, grows up to become a carefree but dedicated young man of whom shares a close bond with Mei, running a Air BNB together. Mei keeps everything about Kit’s mother and life in Hong Kong a secret from Kit.

Meanwhile, back in Hong Kong, Hung continues to run the Ling empire successfully whilst also ruling over the Unholy Alliance, a group of ambitious businessmen who utilises illegal practices to gain profit. One of these businessmen, Wei Lui, used to be one of Hung’s biggest enemies but the rivalry subsided when Wei Lui’s daughter Kate fell in love with Hung’s adopted son Kent, a law consultant for Hung’s company. Hung adopted Kent from the street the same day she sent Kit to Taiwan. Kate also works as the head of PR for Hung’s company.

Hung’s family has expanded, with Hei having two daughters and Lit with two sons. Lit’s older son Anthony is intelligent, quiet and reserved but unable to partake in the family business due to a brain condition whilst his younger brother, Ricky, is ambitious but reckless as well and is Lit’s preferred partner in his real estate business. Hung loves her family dearly and wishes her nieces and nephews to grow up to become responsible and independent adults. Although Hung takes advantage of grey areas in the law to gain profit, she has a bottom line before things gets too far and does not allow innocent lives to be affected. Nonetheless the other businessmen in the Unholy Alliance as well as the police often try to exploit her weaknesses in any possible way.

However, back in Taiwan, Kit found himself as a target to a traveller, Yuen Ching Yan, whom would not leave Kit alone for some reason. One day, the Air BNB came under attack by mafia members and Mei worked together with Yan to protect Kit and help him escape. Kit became shocked that Mei knows how to handle a gun and Mei appears to know Yan as well. During the struggle, Mei was killed and Yan is forced to drag a desperate Kit away. However, Kit became determines to find out what happens and escapes from Yan.

Believing the answers to be in Hong Kong, Kit travels back to Hong Kong and meets up with an old friend whom he met in Taiwan, G-Force, who accommodates him. To Kit’s shock, Yan appears and rigs the apartment with surveillance cameras to spy on him. It is revealed that Yan is one of Hung’a bodyguards and Hung sent her to Taiwan due to sensing danger from members of the Unholy Alliance. Hung herself was nearly killed in a assassination attempt from a Unholy Alliance member, backed up by a unknown source of power.

Kit desperately searches for clues and his leads eventually brings him to Hung’s company where he is shocked to find Hung, who looks exactly like Mei. Hung, however, refuses to acknowledge him for fear of dragging him into danger. However, Kit’s constant probings eventually led to Hung revealing Kit’s true heritage and that she is his biological mother. Kit, however, remains unmoved and not willing to acknowledge a mother whom is part of an underground organisation that played a part in Mei’s death. Kit decides to return to Taiwan, with Hung believing this is the best outcome for both of them.

However, Kit eventually has a change of heart and returns just in time to save Hung from another assassination attempt. Hung and Mr. Yik both agreed perhaps the best way to keep Kit safe is to have him by their side. They also agreed to keep Kit’s heritage a secret from the other family members temporarily. Kit first begins working as a bodyguard for Hung but later transferred to the company’s logistic department.

Over time, Kit worked with Hung, Mr. Yik, Kent, Yan and other members of the Ling industry to eliminate threats posed to not only Hung but the safety of the people of Hong Kong. Kit also wishes Hung will start to let go of her previous methods and run her company legally with no illegal advantages. Hung herself is reluctant but strongly encourages Kit to try to make a difference.

One of the enemies Hung needs to face is a malicious military group from Northern Thailand led by Johnny Cub. Johnny Cub wants Hung’s assistance to ship weapons to other countries but Hung refused, citing the dangers and risks involved. However, unbeknownst to Hung, her nephew Ricky went behind her back to accept the deal. The deal went awry when the weapons were mysteriously stolen before the deal could be completed. Kit discovered Yan stole the weapons in a quest for revenge against Johnny Cub. Yan revealed she was from Northern Thailand and Johnny Cub murdered her family and kidnapped her to train as an assassin. The event left her with severe PTSD, to the point she accidentally attempted to kill Kit and Johnny Cub’s recent appearance caused her to be unable to utilise her instincts and skills. Johnny Cub believes the Ling family is responsible for stealing his weapons and kidnaps Ling Hei’s youngest daughter Chloe as a hostage. Fortunately, Hung and her allies were able to rescue Chloe, destroy the weapons and eradicate the militia and Johnny Cub. Yan was also finally able to overcome her trauma. To Hung’s dismay, her two siblings took advantage of this recent event to attempt to scam one another for additional profit but her biggest shock is discovering Ricky not only accepted Johnny Cub’s deal behind her back but attempted to frame Kit and have him killed by Johnny Cub to cover his own actions, not knowing Kit is Hung’s biological son. Hung then revealed to her family Kit’s true identity and further scolded Ricky that he should not use another person’s life to cover his own actions, regardless they are family or not. As the victim of this betrayal, Hung allows Kit to decide Ricky’s punishment. Kit wishes to forgive but Hung, believing that Ricky’s crimes is too severe, eventually exiled Ricky from the company and the family. Lit has his son relocated to Taiwan, with Ricky swearing revenge.

Kit starts to grow accustomed to his new family members and forms a strong bond with his adopted brother Kent. Kit and Yan also starts developing feelings for each other but Yan is unwilling to commit due to her duties as a bodyguard but Kit wishes for her to live a normal life. However, Ricky’s father Lit holds a strong grudge against Hung and Kit for forcing Ricky away.

Throughout the series, Ling Hung was shown trying to use her power to try to work with a good hearted politician Lee Tit Ngok to wipe out the corrupting and criminal businesses in Hong Kong and wanted to slowly leave the mafia life and do good deeds as a way to correct her past mistake of stepping into the mafia society accidentally, which had caused a lot of offense against the society of Hong Kong in the past and although Ling Hung made many attempts to work with Lee Tit Ngok, there was big barrier due to Rain Man, one of the most top secret mysterious behind the scenes mafia bosses who controls almost all of the underground illegal business activities and gang ambushes in Hong Kong finding out about this, which meant Ling Hung had decided to unknowingly go against Rain Man. As a result, Rain Man created situations that would either target her and/or her family members including members of her alliance, such as attempted ambushes against Ling Hung or manipulative setups to have her family members who were greedy for profits/power and members of her alliance to turn against Ling Hung. Of the ambushes that took place, one of them was when Ling Hung, Kent and Yik Fung attempted to meet with Lee Tit Ngok at a hotel to discuss how to make Hong Kong a better society and despite the fact they used careful procedures to keep the meeting a secret to avoid allowing other mafia bosses to know, Rain Man having heavy surveillance on the Ling family found out about this and stopped the meeting from happening with assassins dressed as hotel workers ambushing them, but luckily Kent and Yik Fung protected Ling Hung and fired their guns against the assassins. Coincidentally this ambush happened at the same time of when Tsz Kit and Mei were ambushed in Taiwan, but with Ching Yan protecting Tsz Kit also arranged by Rain Man. There was also another attempted ambush later on arranged by Rain Man against politician Lee Tit Ngo at a hospital, but was never injured thanks to Tsz Kit, Ching Yan and Kent along with their crew on scene protecting him and shooting their guns against the assassins trying to target Lee Tit Ngok. Very often, a corrupt politician Lau Zak Sing including Wei Lui, Ling Hung's long time enemy were involved with all of these situations as well.

Later on, in one of the final episodes of the series, Ling Hung and the rest of the Ling family would find out the person to be Rain Man was Kam Tin, a corrupt police official and would also find out Kam Tin is the one who has been creating these attempted ambushes or manipulative setups targeting Ling Hung. Wei Lui who realized his mistake of constantly trying to go after Ling Hung, which resulted in his sons being killed had decided to work with Rain Man who he could only communicate with on phone initially and Rain Man was using a disguised voice. Wei Lui's real intention was to try to figure out Rain Man's identity and bring this person down to make up for what he did to his sons as it is revealed Rain Man was also involved in his sons being killed in Taiwan along with controlling almost all of the criminal and ambush activities happening in Hong Kong. Eventually when Wei Lui had a chance to speak to Rain Man in the same room with walls separating them both and with Rain Man still using a disguised voice, he was able to figure out it was Kam Tin due to the fact that Rain Man made a statement that strongly resembled Kam Tin's statement to him years ago when he was in a shootout war against Ling Hung, there was a set up to have him not killed in the shootout as a way to balance out the power between Ling Hung and the mafia alliance. Kent, Kate, Ching Yan and Tsz Kit attempted to save Wei Lui from Kam Tin, however before they could save him, Wei Lui is shot and killed when he discovered Rain Man's real identity, but left a clue with his blood on Tsz Kit's arm before he died, which led them to realize it was a top police official and then Ling Hung would figure out Rain Man is Kam Tin.

Since Ling Hung refused to give up trying to clean up the mafia corruption system in Hong Kong and wanting to try to leave the mafia business slowly, Kam Tin would not stand for this, which would result in Kam Tin escalating manipulative deadly threats against her family members as a way to try to wipe out Ling Hung. Tsz Kit's aunt Ling Hei and his cousin Anthony being greedy for profits and power took advantage of the situation by creating a plot to try to force Ling Hung into signing over her power rights to her assets and the powerful corporate business over to them. Anthony revealed to Ling Hei that his father Lit had bought a poison potion from the black market years earlier in case Lit decided to use it one day to kill Ling Hung to gain access to her business and profits. Anthony's plan was to add the poison into Ling Hung's drink or food when the right opportunity comes, which would cause her to have heart attack like symptoms and to use that opportunity to try to make Ling Hung sign her power rights to her assets and her corporate business over to them and if she complied, she would be given an antidote or if she did not comply, she would be left to die either way as a chance for them to gain profits/power for their greedy needs in addition they would have the power to decide to not go against Rain Man and the mafia system of Hong Kong as their supposedly theoretical thinking to end Rain Man's vendetta against the Ling family. Ling Hei went along with Anthony's plan and one morning, Anthony added the poison into Ling Hung's soybean drink during breakfast to go on with this plan. However, this plot failed as the Ling family all discovered Ling Hei's and Anthony's tactics as Yik Fung, Ling Hung's bodyguard had recorded their conversation to poison Ling Hung, including that Ling Hung, Tsz Kit and Kent Ling tested them out by asking them that one of them should drink Ling Hung's glass of soybean milk, which contained the poison intended for Ling Hung and this would lead to their exposures of this attempt to kill Ling Hung. Tsz Kit even attempted to pour the poisoned soybean milk into Anthony's mouth as a warning to him. At this moment, Tsz Kit's tough mafia behavior has been slowly becoming more intense as he has experienced so many dangerous situations including losing his adoptive mother Mei and much later on his best friend G Force to mafia violence. Kent Ling then made a statement in that moment that the poison tumor must be eliminated immediately, which the expression means if there is a family member who is a potential dangerous threat to the family household, that person must be eliminated immediately, which likely meant death or more lives would be hurt. However, Ling Hung forgave them and gave them another chance after hearing pleas from other family members to not eliminate them.

Ling Hung decided to end their very large corporate business they have had for many years, which actually was built up based on resources from the underground illegal businesses Ling Hung was involved with for many years. Ling Hung hoped this would be a way to leave the mafia business and to lead to a more simpler lifestyle, however Tsz Kit's aunt Ling Hei and cousin Anthony refused to accept this reality and being they wanted to continue to live the luxurious lifestyle they have had for so long and wanted power/profits, they formed their plot again in the final episode to kill Ling Hung to take over the business for their benefit to gain power/profits by trying to get in touch with Rain Man to help out, which Tsz Kit discovered on time and then at that moment Tsz Kit's ruthless tough mafia demeanor becomes even more intensely vicious, blood thirsty and unforgiving than Ling Hung ever was and this time he created a set up including playing games with them to sentence them to their deaths. Although Tsz Kit's mother had ordered him to bring Anthony and Ling Hei back to let Ling Hung punish them her way without violence because they are family, Tsz Kit who was now blood thirsty for Ling Hei and Anthony ignored Ling Hung's orders and unforgivably ruthlessly decided their punishment should be death, which he successfully accomplished. Tsz Kit devised a plan to have Ling Hung go into a safe shelter in hiding as it was revealed Rain Man had hired very high skilled professional assassins from mainland China meant to target Ling Hung and knowing that Ling Hei had heavy surveillance on Ling Hung's location and made attempts to contact Rain Man to kill Ling Hung, Tsz Kit created a set up to fool Ling Hei into thinking Ling Hung was kidnapped by Rain Man's henchmen, then in which Ling Hei went into Ling Hung's company office to create a false contract stating Ling Hung had signed over the rights of the company to her including even forging Ling Hung's signature, but Anthony walked in and threatened her with a gun into redoing the contract to have the company inherited to him, which Ling Hei did out of no choice and then tried to kill Anthony with a letter opener, but Anthony overpowered her and grabbed the letter opener stabbing and killing Ling Hei. Anthony then brings in the false contract stating he is now the head chairperson of the company into the meeting room with the rest of the alliance members, which were expecting Ling Hung to be at the meeting due to the fact Tsz Kit had posted a false meeting notice to the mafia public that Ling Hung was setting up the meeting with them as a way to fool Rain Man into thinking Ling Hung was going to be at the meeting and Tsz Kit knew that Rain Man would devise a sneaky set up to kill Ling Hung in the meeting room, but since Tsz Kit was so furious to find out Anthony and Ling Hei were trying to get Rain Man's help to kill Ling Hung, Tsz Kit wanting to protect Ling Hung made sure it was either Ling Hei or Anthony or both of them to fall into Rain Man's trap to be killed. He wanted the rest of the alliance members to fall into this trap since he knew how much they wanted to take down or kill Ling Hung to take over her chairperson seat and gain power, which was accomplished as Rain Man did set up a secret poison gas in the meeting room meant for Ling Hung, which killed all of the alliance members including Anthony, however Ling Hei was already killed by Anthony and placed into the trunk of his car. It is revealed Tsz Kit had bribed a telecommunications staff into exclusively redirecting all of Ling Hei's and Anthony's communication messages meant for Rain Man to Tsz Kit's cell phone, which is how Tsz Kit was able to figure out all of Ling Hei's and Anthony's plans to kill Ling Hung. At this point, the personality roles between Tsz Kit and Ling Hung switched where Tsz Kit is now making more extreme ruthless decisions and Ling Hung has become more soft-hearted. Ling Hung was devastated and in heavy tears by and questioned Tsz Kit's ruthless cold actions especially on why he did not stop Ling Hei's and Anthony's evil plans and bring them back to allow Ling Hung to manage the punishment for them and to give them another chance to correct their mistakes, however Tsz Kit responded that he knew that Ling Hung would be too soft-hearted to give an appropriate fair punishment to Anthony and Ling Hei and that they would have become more ruthlessly greedy with wanting power and profit including continuously pursuing to try killing Ling Hung to gain profit and power and would never learn from their mistakes. Tsz Kit also stated to Ling Hung and Kent Ling he will not stand to let his own mother along with any other innocent family members to die no matter what he has to do to protect them. Tsz Kit also bluntly said, if he was given another chance to handle the situation with Ling Hei and Anthony again, he would make the same decisions. Ling Hung responded with words saying he was ruthlessly conniving and too extreme and evil-spirited. Tsz Kit then reminded Ling Hung that she had taught him to be firm and tough in making prompt decisions in critical dangerous moments in the mafia society. Ling Hung and Kent Ling whom were involved in the conversation with Tsz Kit over his ruthless actions started realizing and became too overwhelmingly and terrifyingly horrified and shocked as seen on their faces with guilt and fear that Tsz Kit who was once one of the most warm hearted easily forgiving member who was often more of a Peace maker as harmless as an Angel of the Ling family now have seemingly quickly turned into the most ruthless terrifying vicious blood thirsty Mafia as dangerous as the Devil/Satan of the Ling family who will now unforgivably and notoriously go to any extreme ruthless lengths to eliminate anyone who turns against or is a threat to the Ling family in any form. Ling Hung reacted almost in wanting to slap Tsz Kit for his vicious ruthless actions, but when she realized Tsz Kit was right about her teaching him to be firm and tough in the mafia society, she turned her hands and slapped herself and then fell to her knees in heavy tears feeling guilty and responsible that she turned Tsz Kit from an innocent warm-hearted easily forgiving person who was living a normal life to being a ruthless vicious cold unforgiving blood thirsty triad. Tsz Kit and Kent Ling started to tear up seeing Ling Hung's devastation and tried comforting Ling Hung and Tsz Kit even tried to tell her it is not her fault, but Ling Hung was too terrifyingly horrified and guilty to see what Tsz Kit has become as if she saw Lucifer took possession of Tsz Kit and pushed him away and Kent Ling brought her back into her bedroom to recuperate her emotions.

It was revealed that Kam Tin, a corrupt police official is Rain Man, which is a name given to her to keep her identity a secret who is in a more higher ranking mafia position and has been pulling the strings controlling almost all of the illegal businesses and gang ambushes in Hong Kong and has been after Ling Hung and her entire family. Tsz Kit and his adopted brother Kent along with his team were able to expose Kam Tin as Rain Man, resulting in her identity no longer being a secret to the public. They were nearly successful in having Kam Tin captured by the authorities, but Kam Tin escaped through a slim chance and eventually she sets up an attempt to have her henchmen kidnap Ling Hung, which would cause Ling Hung's bodyguard Yik Fung to be killed in the process when he tried to save her. Kent Ling and his team of assassins are then forced to rescue Ling Hung, but it involved them and Ling Hung having to be in a very deadly gun battle against Kam Tin's henchmen and unfortunately Kent Ling's team are all killed in the process. Meanwhile, Tsz Git finds out who the most richest top Hong Kong mafia bosses are that gave Kam Tin the position to be Rain Man and with the incriminating evidence Tsz Kit had against Kam Tin, which also included involvement with these higher up mafia bosses along with proof that Kam Tin wanted to eventually betray them with the evidence she kept on them and since Kam Tin's secret identity as Rain Man was now exposed, he manages to convince the much higher up mafia bosses of Hong Kong to have Kam Tin's henchmen turn their guns against her executing Kam Tin to her death successfully saving Ling Hung and Kent Ling. Equivalent to Mei's attempt many years earlier to try to save Ling Hung and have her leave the mafia business, which unfortunately was a temporary success, Tsz Kit willingly took over the position as Rain Man working for them, being in one of the highest ranking ruthless mafia positions in Hong Kong far surpassing the highest status position Ling Hung has ever held in the mafia society. The motive was to save his mother and get her and the whole Ling family to leave the dangerous underground business safely to a normal simple safer life, which proved to be permanently successful this time unlike Mei's attempt many years ago. Including that Tsz Kit wanted to use the opportunity to get evidence to expose the most top Hong Kong mafia bosses of their illegal doings to prevent them from doing more harm to the Hong Kong society.

Two years later, Ling Hung has shut down her empire and along with her mother, her two nieces Chloe and Kelly, Kent and Kate has relocated to the rural areas. Kate is also pregnant with Kent’s child. Ching Yan traveler who makes visits to the family often and still believe that there is a chance Tsz Kit is still alive. Meanwhile, Tsz Kit has been working as Rainman for the past 2 years, gaining the trust of the mafia bosses before revealing to them he has exposed their criminal deeds for the world to see. As Tsz Kit left, he reunites with Ching Yan outside.

The Ling Family

 * Nina Paw as Ling Hung (令熊), a powerful businesswoman who runs several international syndicates across the world. To protect her son from falling into the hands of her enemies, she sends him to Taiwan, where he is raised by a foster mother. Her role is likened to the Chinese female Wu Zetian and Vito Corleone from The Godfather.
 * Ruco Chan as Ko Tsz-kit (高子杰), Ling Hung's biological son, who was raised in Taiwan. He goes on a search for his true parentage after surviving an assassination attempt. In a grand plan to fool Rainman and gain her trust, Kit takes over as temporary president of the Union while keeping a ruse that she has divided the family apart. To ultimately save his mother and Kent, he replaces Kam Tin as Rainman and spends the next two years taking down Hong Kong's corruption before returning home to his remaining loved ones.
 * Nancy Wu as Naka Yuen Ching-yan (阮清欣), Tsz-kit's bodyguard, who poses as a backpacker when she first meets him. Yan is actually sent by Ling Hung to protect him. She was born in a village located in the northern part of Thailand. She was trained to be a killing machine at her childhood.
 * Joel Chan as Kent Ling Tsin-yau (令千佑), Ling Hung's adopted son who was picked up on the day of Ling Hung's son Tsz-Kit's birthday. Despite knowing that Kit is his mother's illegitimate son, he does not hold any hard feelings and gets along with him well.
 * Elaine Yiu as Kate Wei Yi-yau (韋以柔), Kent's girlfriend, and is in charge of public relations at Ling Hung's company. She is the youngest daughter of the Wei family, the enemy family of Ling Hung.
 * Kwok Fung as Wei Lui (韋磊), Kate's father. Rival/Enemy of Ling Hung indirectly cause his two sons' death seeks redemption in near the finale by sacrificing himself to reveal the identity of Rainman
 * Jimmy Au as Yik Fung (易風), Ling Hung's bodyguard and trustworthy friend. Died in the finale while protecting Ling Hung from Rainman's henchmen
 * KK Cheung as Ling Lit (令烈), Ling Hung and Ling Hei's younger brother. Died in a car explosion cause by Rainman's henchmen.
 * Mary Hon as Ling Hei (令熹), Ling Hung and Ling Lit's sister. Killed by Antony in the finale to get hold of Ling corporation.
 * Pierre Ngo as Ricky Ling Chi-sin (令智煽), Ling Lit's younger son Shot to dead in self-defense by Ko Tsz-kit in Taiwan for plotting to kill Ling Hung with no remorse after his plotting with the Lui family was exposed.
 * Lam Tsz-sin (Jazz Lam) as Anthony Ling Ka-ming (令家名), Ling Lit's older son Killed by poison gas set by Rainman for Ling Hung, which he became a scapegoat caused by Ko Tsz-kit in the finale.
 * Roxanne Tong as Kelly Law Ho-man (羅皓雯), Ling Hei's older daughter.
 * Bella Lam as Chloe Law Ho-yee (羅皓兒), Ling Hei's younger daughter.

Recurring cast

 * Griselda Yeung as Tina, Ling Lit's wife
 * Becky Lee as Hilda, Ling Ka-ming/Anthony's wife has an affair with Ling Chi-sin
 * Carlo Ng as Sunny, Ling Hei's husband
 * Oscar Leung as G-Force, Ko Tsz-Kit's best friend
 * Man Yeung as Wei Lui's older son/Michael Died with his younger brother in Taiwan when trying to save his younger sister, Kate
 * Mandy Lam as Wei Lui's older son's wife, Wei Lui's older daughter-in-law
 * Stefan Wong as Wei Lui's younger son/George Die with his older brother in Taiwan when trying to save his younger sister, Kate
 * Kimmy Kwan as Wei Lui's younger son's wife, Wei Lui's younger daughter-in-law
 * Stephen Wong Hong Kong Police Inspector
 * Lily Leung as Ling Hung's mother
 * Elena Kong as Kam Tin also known as 'Rainman', Hong Kong's Chairman of the Criminal Justice Committee. Controls Hong Kong's corrupted police officers and blackmails high position officials supported by four corrupted greedy richest men in Hong Kong. Killed by her henchman on the order of her behind scene bosses after she is no longer useful to them since her identity was exposed to the public.
 * Chloe Yuen (阮兒) in flashback, as Ling Hung's best friend and body double; introduced in Ep.6
 * Candice Chiu in flashback, as young Ling Hung

Production and casting
Producer Jazz Boon had always wanted to do a kung fu-themed production. After the commercial success of his 2014 television drama Line Walker, Boon was finally given the opportunity to conceive his own kung fu story with 2016's A Fist Within Four Walls. Boon had strong chemistry with the A Fist Within Four Walls cast. Halfway into filming the drama, he started working on The Unholy Alliance with his Four Walls cast in mind.

The Unholy Alliance was officially announced in mid-August 2016. The Hong Kong media regarded it as a "modern" version of Boon's A Fist Within Four Walls, which was set in the 1960s. Four Walls leads Ruco Chan and Nancy Wu were the first cast members to be announced for The Unholy Alliance in August 2016. Paw Hee-ching, who was in negotiations with TVB since March 2016, was announced next. The Unholy Alliance is Paw's first TVB production.

Lam Tsz-sin, Elaine Yiu, Joel Chan, Oscar Leung, and Bella Lam were confirmed to be part of the cast days later. Four Walls actors Grace Wong and Benjamin Yuen were invited to star, but declined the offer due to schedule clashes. The action choreographer for The Unholy Alliance was announced to be Philip Kwok, who also choreographed Four Walls.

On 24 July 2017, the opening theme video was released.