
8.4
Two friends in the past were victims of serious school bullying. One could not resist his trauma, and becomes a serial killer, walking in the path of revenge. Another one tries his best to overcome the trauma and becomes a police detective. He now faces tragic fate to risk his life to capture the serial killer.
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1Episode 1Prelude to Revenge
55 min
Kyung-min leaves a message to Jong-suk at a crime scene. Jina delivers the message to Jong-suk. Thus, Jong-suk and Kyung-min reunite through the message for the first time in twenty years.
2Episode 2First Revenge
44 min
Jong Suk helps Ji Na solve the case. They found out that Kyung Min lived with an alias for a certain amount of time Meanwhile, Kyung Min determines revenge against An Jeong Hee. who tormented him during his school days.
3Episode 3Prelude to the Chase
57 min
Kyung Min leaves a second message to Jong Suk at the murder scene. Jong Suk realizes that Kyung Min is revenging every perpetrator of school violence. And Jong Suk reminds a terrible memory from the past.
4Episode 4Start of Tracking
57 min
A special investigation team is launched and Jong Suk and Ji Na chase after Kyung Min. The team investigates the graduates of Shin Suk middle school. Ji Na meets the teacher and Jong Suk goes to Kang Min.
5Episode 5Confession
57 min
Jong-suk confesses that he also was one of the victims of school violence to Jina. And a video of Kang-min confined by Kyung-min arrives.
6Episode 6Second Revenge
53 min
Jong-suk and Jina figure out the place where Kang-min is kidnapped. Kyung-min revives Kang-min's memory via quizzes. Kyung-min asks about Chul to Kang-min.
7Episode 7Another Friend
53 min
Jina got to know another key figure, Kim Chul. Jina asks Jong-suk about Chul, but he stays silent. So, Jina searches for the truth by herself.
8Episode 8Third Target
58 min
Jong-suk figured out the next crime target and rushed to him. The third target sincerely apologizes to Jong-suk. Jina meets Chul's mother to investigate Chul.
9Episode 9Fourth Target
50 min
Jina gets a step closer to the truth with the handwriting analysis of Chul's suicide note. Jong-suk reveals the identity of "Dog Park" as he looks for Kyung-min's next target.
10Episode 10King of Pigs
64 min
Jina heads to the mansion to discover Chul's unperformed project. There she finds a note that Kyung-min left and confronts the truth from twenty years ago.
11Episode 11Past is Present
52 min
Jina detects the truth behind Chul's death. While Jong-suk's anxiety intensifies, Kyung-min comes into the police station.
12Episode 12Last Target
64 min
Jong-suk and Jina doggedly track down Kyung-min. Jong-suk, Kyung-min, and other alumni from twenty years ago gather in one place.

Kim Dong-wook
Hwang Kyung-min

Kim Sung-kyu
Jung Jong-suk

Chae Jung-an
Kang Jina

Choi Hyeon-jin
Kim Chul

Oh Min-suk
Kang-min

Moon Seong-hyun
Kang-min (teen)

Han Soo-yeon
Park Min-ju

Lee Ji-ha
Kyung-min's mother

Jung Eui-jae
Jin Hae-su

Ji Chan

Song Seung-hwan

Sim Hyun-seo
Jung Jong Suk
8.5