The King in Love

The King in Love is a 2017 South Korean historical drama directed by Kim Sang-hyeop with screenplay by Song Ji-na, Park Chan-kyung and No Sun-jae, based on the novel of the same name by Kim Yi-ryung. It starred Im Si-wan, Im Yoon-ah and Hong Jong-hyun. The pre-produced drama aired on MBC from July 17 to September 19, 2017, on Mondays and Tuesdays at 22:00 (KST).

Synopsis
Set in the Goryeo dynasty, it tells the story of a young and ambitious monarch named Wang Won (Im Si-wan) with a desire to conquer, and two people who shape his destiny; childhood friend Wang Rin (Hong Jong-hyun) and a beautiful young woman named Eun San (Im Yoon-ah). These three get to know each other and become the closest of friends but feelings of affection and love arise between these three. The young Crown Prince, falls in love with the young woman Eun San and would do anything to save her. He comes to love her more than himself. But on the other hand, his childhood friend Wang Rin also fell in love with Eun San at first sight. Even though he loves her so much, he still hid his affection for her because of his duty to his Crown Prince and because he doesn't want to hurt his best friend's feelings. But the time came when Eun San realizes her feelings for Rin and vice versa.

Main

 * Im Si-wan as Crown Prince Wang Won
 * Nam Da-reum as young Wang Won
 * Moon Woo-jin as child Wang Won
 * Song Min-jae as child Wang Won
 * The crown prince of Goryeo; Korea's first royalty of mixed heritage; grandson of Kublai Khan.


 * Im Yoon-ah as Eun San, Princess Hyeonae / So-hwa
 * Lee Seo-yeon as young Eun-san
 * The strong-willed daughter of a wealthy nobleman, who possesses striking beauty and deadly charm. She hides her identity in order to survive. She started to return Wang Rin's feelings.


 * Hong Jong-hyun as Wang Rin
 * Yoon Chan-young as young Wang Rin, Marquess Sujeong
 * Won's childhood friend; an elegant and refined man with an upright nature. He started to fall in love with Eun-san.


 * Oh Min-suk as Song In

Royal Family

 * Jeong Bo-seok as King Chungnyeol, 25th king of Goryeo, Wang Won's father
 * Jang Young-nam as Princess Wonseong (Qutlugh Kelmysh Beki), Kublai Khan's daughter; Chungnyeol's wife & Wang Won's mother
 * Kim Bo-ra as young Princess Wonseong
 * Kim Byung-chun as Choi Se-yeon, Princess Wonseong's eunuch
 * Kim Jae-woon as In-hu / Hulatai
 * Min Young-won as Court Lady Jo, Princess Wonseong's court lady
 * Baek Song-yi as Princess Wonseong's female bodyguard

Wang Won's side

 * Kim Jeong-wook as Eunuch Kim, Wang Won's attending eunuch
 * Bang Jae-ho as Jin-kwan, Wang Won's bodyguard
 * Ki Do-hoon as Jang Ui, Wang Won's bodyguard

Wang Rin's side

 * Kim Ho-jin as Wang Young, Marquess Seowon; Wang Rin's father
 * Park Hwan-hee as Wang-Dan, Wang Rin's younger sister who has a crush on Wang Won
 * Yoon Jong-hoon as Wang Jeon, Marquess Seoheung; Wang Rin's elder brother

Eun San's side

 * Lee Ki-young as Eun Young-baek, Eun San's father
 * Um Hyo-sup as Lee Seung-hyu, Eun San's teacher
 * Park Ji-hyun as Bi-Yeon, Eun San's personal maid
 * Song Soo-hyun as young Bi-yeon
 * Kim Jung-hak as Goo Hyung

Song In's side

 * Choi Jong-hwan as Song Bang-young, Song In's cousin.
 * Choo Soo-hyun as Shi Moo-bi / Ok Boo-yong, a doctor who is also Song In's girlfriend who spies the king after seducing him.
 * Park Young-woon as Moo-suk, the man with the snake tattoo.

Others

 * Ahn Se-ha as Gae-won
 * Moon Won-joo as Senior guard Shik
 * Kim Kyung-jin as Yum-bok
 * Moon Jung-soo as Dol-bae
 * Kang Ye-sol as Princess Jeonghwa, King Chungnyeol's first wife
 * Kim Sung-jae as Duke Gangyang
 * Yoon Yoo-sun as Lady Kim
 * Cha-yeop as Byung-soo
 * Kang-hee as Sung-jae
 * Oh Ki-hwan as Kwan-gun
 * Lee Dae-seung as Jang-in
 * Kim-Young as Hak-ja
 * Park Jong-hyun as General Im
 * Ha-min as Ahn San-daek
 * Park Won-ho as Chul-koo
 * Seo Beom-sik
 * Jeon Heon-tae
 * Yeom Jae-wook
 * Kim Hwa-yeon
 * Lee Han-wi
 * Yeom Jae-wook
 * Jeong Ji-hoon
 * Kim Ki-tak
 * Park Hye-jin

Production

 * The series is one of a handful of youth sageuk set in production after the success of Love in the Moonlight (2016) starring Park Bo-gum and Kim Yoo-jung.
 * Its first script reading took place on December 21, 2016 at MBC in Sangam, Seoul, South Korea. Filming commenced in late 2016 and concluded in June 2017.  It is invested by Chinese company Tencent.