Catch the Ghost

Ko Ji-seok is the head of the Wangsuri station Subway Police Squad. His peace breaks with an event.

Yu Ryeong faces a crisis on the first day of joining Ji-seok's team by entering a forbidden tunnel.

Absurdly, Yu Ryeong earns the chance to investigate the tunnel. Then, Choi Do-cheol goes missing.

Choi Do-cheol case's truth reveals. While investigating, Ji-seok's impression of Yu Ryeong changes.

Ji-seok decides to kick Yu Ryeong out of the team because she kept investigating at her will.

Yu Ryeong and Ji-seok take the first train to find out the rumor's truth and encounter a suspect.

A co-investigation of General Investigations and Ji-seok's squad begins. Ji-seok and Ma-ri reunite.

Yu Ryeong speeds up her investigation of the tunnel. An autistic child is kidnapped at the station.

Showing great partnership, Yu Ryeong and Ji-seok run together to catch the abductor of Jung-hoon.

The identity of the subway ghost slowly unmasks as they find the hiding place of the criminal.

The suspect of the subway ghost narrows down. Yu Ryeong and the squad track down the ghost.

The investigation is on hold because of the runaway suspect and Ji-seok is about to be dismissed.

Finally, the shocking story behind the subway serial killer unfolds, which surprises everyone.

The secret of the subway ghost uncovers. Yu Ryeong finds hope with the words that Yu Jin is alive.

An outraged subway ghost threatens Yu Ryeong. Surprisingly, Yu Jin appears in the middle of chaos.