When a strangled chef falls off a roof, Kwon Jae-hui becomes a suspect, but a scent leads Cho-rim elsewhere. Mu-gak learns why Baek-gyeong went to Jeju.
The Barcode Killer places the next body so it will be found, and covers his tracks. Cho-rim's friend Ma Ae-ri is accused of stealing from her employer.
Cho-rim reveals her special ability to the entire Violent Crimes Unit. The Barcode Killer uses the witness's old school friends to lure her into a trap.