A serial murder case resembling that of Jung I Sin makes Cha Su Yeol face what he's been avoiding all along.

Cha Su Yeol finds the suspect but the victim is missing, and Jung I Sin's true nature is revealed.

Jung I Sin helps Su Yeol amid a series of murder cases, but her true motives are unclear.

The killer targets Su Yeol and his family. Jung I Sin tells him to take down anyone who threatens his family.

As Jung I Sin's past gradually comes to light, Su Yeol's secrets are brought to the surface as well.

Su Yeols's brother-like friend is murdered before his eyes and now Su Yeol turns to Jung I Sin for help.