Yu Ryeong and Ji-seok take the first train to find out the rumor's truth and encounter a suspect.
Subtitles: English
Directed by:Shin Yoon-sub
Season 1
S01:E01 - Episode 1
Ko Ji-seok is the head of the Wangsuri station Subway Police Squad. His peace breaks with an event.
S01:E02 - Episode 2
Yu Ryeong faces a crisis on the first day of joining Ji-seok's team by entering a forbidden tunnel.
S01:E05 - Episode 5
Ji-seok decides to kick Yu Ryeong out of the team because she kept investigating at her will.
S01:E06 - Episode 6
Yu Ryeong and Ji-seok take the first train to find out the rumor's truth and encounter a suspect.
S01:E07 - Episode 7
A co-investigation of General Investigations and Ji-seok's squad begins. Ji-seok and Ma-ri reunite.
S01:E13 - Episode 13
Finally, the shocking story behind the subway serial killer unfolds, which surprises everyone.
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