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.

Cleared of suspicion, Kang Woo reveals his wretched past to Kwon Joo. Later, the true serial killer attacks Seo Yool and gives Kwon Joo an ultimatum.

Je Soo turns himself in, leading to an intense face-off with Kang Woo. An unexpected play from Je Soo launches Kwon Joo and Kang Woo into action.