The Subway Police of Wangsoori Station is led by Chief Inspector Ko Ji Seok. He is the best of the best, although his...

Ryung officially becomes a member of the Wangsoori Subway Police and Ji Seok’s partner. Ryung gets into trouble from ...

Ryung and Ji Seok attend the disciplinary committee hearing and return to the station for night duty. Thanks to Ji Se...

Ryung and Ji Seok save Choi Do Chul just in time. Throughout their investigation, Ji Seok miraculously learns to appr...

Ji Seok makes up his mind to kick Ryung out of the Subway Police for taking investigations into her own hands all the...

A rumor circulates about people disappearing after they party all night on Club Day, then taking the first train home...

Subway Police and the Metropolitan Detective Division come together for a joint investigation. Despite Ji Seok’s jeal...

Ma Ri leaves Ryung after saying harsh words that keep replaying in Ryung’s mind. Still, Ryung continues her search fo...

Ryung and Ji Seok work together to save Jung Hoon and catch the kidnapper. With their great partnership, they discove...

The Subway Ghost’s hideout is finally uncovered. Through the evidence found in the hideout, the police slowly start t...

The police make headway on the Subway Serial Murders and narrow down the suspect list. After getting a tip about the ...

One of the Grasshoppers gets away from the police. The other two Grasshoppers confess that they only know him as Han ...

Ji Seok and Ryung catch the remaining Grasshopper who everyone believes is the Subway Ghost. However, while being int...

The police believe the Subway Ghost is in a mental hospital and that he plans to commit another murder. They chase hi...

Ryung and Ji Seok make their way into Kyung Hee’s house and find a room that looks like a young girl’s. After sharing...

Finally, Ryung and the Subway Ghost come face to face. As his rage explodes, the Subway Ghost attacks Ryung, but anot...