Nobody Knows (TV series)

Nobody Knows is a 2020 South Korean television series starring Kim Seo-hyung, Ryu Deok-hwan, Park Hoon and Ahn Ji-ho. It aired on SBS TV from March 2 to April 21, 2020.

Ahead of the premiere, a webtoon depicting why Cha Young-jin became a detective was released on KakaoPage.

Synopsis
Still haunted by the death of her friend who was murdered 19 years ago by the infamous Stigmata serial killer, detective Cha Young-jin (Kim Seo-hyung) is determined to catch the culprit.

She is soon joined by school teacher Lee Sun-woo (Ryu Deok-hwan), and they do their best to protect the youth at risk, whose lives could have been changed if they had been surrounded by good adults. One such youth is Go Eun-ho (Ahn Ji-ho), a sixteen-year-old boy who lives in the same apartment block as detective Cha Young-jin, and who seeks her friendship to avoid a traumatic home life. The school he attends, where also Lee Sun-woo is a teacher, has close connections to a church and religious cult, and following a single act, saving the life of an old man (Kwon Hae-hyo) who collapsed in the street, he finds himself drawn into a web of intrigue, corruption and murder.

Main

 * Kim Seo-hyung as Cha Young-jin
 * Kim Sae-ron as young Cha Young-jin
 * Ryu Deok-hwan as Lee Sun-woo
 * Park Hoon as Baek Sang-ho
 * Ahn Ji-ho as Go Eun-ho

Seoul Metropolitan Police Agency

 * Moon Sung-keun as Hwang In-beom
 * Min Jin-woong as Lee Jae-hong
 * Kang Ye-won as Yoon Ja-young
 * Jun Suk-chan as Kim Byung-hee
 * Baek Soo-jang as Park Jin-soo
 * Park Chul-min as Han Geun-man

New Life Church

 * Kang Shin-il as Seo Sang-won
 * Kwon Hae-hyo as Jang Ki-ho
 * Baek Hyun-joo as Im Hee-jung
 * Jeon Moo-song as Kwon Jae-chun

Shinsung Middle School

 * Jo Han-chul as Yoon Hee-seob
 * Yoon Chan-young as Joo Dong-myung
 * Yoon Jae-yong as Ha Min-sung

Baek Sang-ho's people

 * Seo Young-joo as Kim Tae-hyung
 * Shin Jae-hwi as Oh Doo-seok
 * Tae Won-seok as Go Hee-dong
 * Park Min-jung as Bae Sun-ah

Others

 * Choi Go as Joo Han-sol
 * Ahn Mi-na as Lee Sun-kyung
 * Jang Young-nam as Jeong So-yeon
 * Han Soo-hyun as Kim Chang-soo
 * Seo Yi-sook as Soo-jung's mother
 * Kim Nam-kyoon as a detective
 * Kim Si-eun as Choi Soo-jung
 * Ham Sung-min as Lee Young-shik's friend
 * Lee Joo-young as Min-sung's mother
 * Jang Jae-ho as Choi Dae-hoon
 * Min Sung-wook as Kevin Jung
 * Ryu Sung-rok as Lee Young-shik