| Duration: | 4140 min |
|---|---|
| Genres: | Drama, Comedy, Romance |
"From the first train to the last! Our underground is busier than above!" The citizens' most-used mode of transportation, the subway! The Subway Polic…
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.
