16. Episode 16

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

15. Episode 15

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

14. Episode 14

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The subway ghost in the hospital prepares another murder. A fierce investigation continues.

13. Episode 13

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

12. Episode 12

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

11. Episode 11

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

10. Episode 10

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

9. Episode 9

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

8. Episode 8

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

7. Episode 7

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

6. Episode 6

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

5. Episode 5

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

4. Episode 4

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

3. Episode 3

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

2. Episode 2

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

1. Episode 1

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