A detective investigating a series of murders comes to realize that the cases are connected to someone from his past: his childhood friend.
Subtitles: English
Directed by:Dae-jin Kim
Season 1
S01:E01 - Episode 1
Kyung-min leaves a message for Jong-seok at the crime scene. Ji-na relays it, reuniting them after twenty years.
S01:E02 - Episode 2
Jong-seok helps Ji-na investigate and discovers Kyung-min used an alias. Meanwhile, Kyung-min seeks revenge on his former abuser, Ahn Jung-hee.
S01:E03 - Episode 3
Kyung-min leaves a second message for Jong-seok at a murder scene, triggering painful memories of past bullying.
S01:E04 - Episode 4
A special task force forms as Jong-seok and Ji-na pursue Kyung-min.
S01:E05 - Episode 5
Humiliated by a mysterious man, Ji-na questions Jong-seok, who reveals he was also a bullying victim. A video of Kang-min in captivity arrives for Jong-seok.
S01:E06 - Episode 6
Jong-seok and Ji-na discover Kang-min's location. Kyung-min revives his memory with a quiz and questions Kang-min about Cheol.
S01:E07 - Episode 7
Ji-na learns about another key figure, Cheol. She probes Jong-seok, but he stays silent, prompting her to search for the truth alone.
S01:E08 - Episode 8
Jong-seok rushes to the next target, who offers a heartfelt apology. Ji-na visits Cheol's mother for clues.
S01:E09 - Episode 9
Ji-na gets closer to the truth through Cheol's note. Jong-seok discovers Dog Park's identity.
S01:E10 - Episode 10
Ji-na heads to Abang-gung to uncover Cheol's past and discovers Kyung-min's notes.
S01:E11 - Episode 11
Ji-na uncovers the secret behind Cheol's death, while Kyung-min visits the police.
S01:E12 - Episode 12
Jong-seok desperately chases Kyung-min, while Ji-na follows to prevent another death.
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