Yu Ryeong faces a crisis on the first day of joining Ji-seok's team by entering a forbidden tunnel.
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:E03 - Episode 3
Absurdly, Yu Ryeong earns the chance to investigate the tunnel. Then, Choi Do-cheol goes missing.
S01:E04 - Episode 4
Choi Do-cheol case's truth reveals. While investigating, Ji-seok's impression of Yu Ryeong changes.
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:E08 - Episode 8
Yu Ryeong speeds up her investigation of the tunnel. An autistic child is kidnapped at the station.
S01:E09 - Episode 9
Showing great partnership, Yu Ryeong and Ji-seok run together to catch the abductor of Jung-hoon.
S01:E10 - Episode 10
The identity of the subway ghost slowly unmasks as they find the hiding place of the criminal.
S01:E11 - Episode 11
The suspect of the subway ghost narrows down. Yu Ryeong and the squad track down the ghost.
S01:E12 - Episode 12
The investigation is on hold because of the runaway suspect and Ji-seok is about to be dismissed.
S01:E13 - Episode 13
Finally, the shocking story behind the subway serial killer unfolds, which surprises everyone.
S01:E14 - Episode 14
The subway ghost in the hospital prepares another murder. A fierce investigation continues.
S01:E15 - Episode 15
The secret of the subway ghost uncovers. Yu Ryeong finds hope with the words that Yu Jin is alive.
S01:E16 - Episode 16
An outraged subway ghost threatens Yu Ryeong. Surprisingly, Yu Jin appears in the middle of chaos.
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