The police make headway on the Subway Serial Murders and narrow down the suspect list. After getting a tip about the identity of one of the Grasshoppers, Ryung and the Metropolitan Detective Division chase him down as he might be the Subway Ghost. Meanwhile, Ji Seok’s investigative instincts start acting up again, despite his suspension.
드디어 지하철연쇄살인사건의 용의자가 좁혀지고..
유령과 광역수사대는 본격적으로 지하철유령을 추적한다!
지석의 수사 본능 또한 다시 꿈틀대기 시작하는데..!
