Catch the Ghost

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

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.

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