When Shi Mok hears who's gone missing, he starts gathering clues by going through phone records. Yeo jin begins her own investigation.

Leading police effords to lcoate Dong Jae, Yeo Jin connects the case to that of the dead policeman. Shi Mok pays Yun Jae a visit.

A perplexing photo containing a disturbing message surfaces. The police consider the possibility of the culprit being one of their own.