Na plants more seeds of suspicion in Kwon Joo's mind, telling her of Kang Woo's past and bouts of amnesia. Eun Soo is threatened by an ex-boyfriend.

Amid suspicions that Eun Soo may have played a part in a stabbing, the team arrests its suspects. But they notice evidence of yet another accomplice.

Clues suggest Na is in danger. Later, an injured man resembling Kang Woo is spotted hobbling away from a bloody crime scene where Na's ID is found.