Flower of Evil

Detective Cha is Dead (1x15)

:

The police find out how the autopsy doesn’t match with the last footage of Park Soon Young alive. They wind down and find out that she was long dead at Director Baek’s house. As an attempt to trick the culprit, they fake Hae Su’s attack as Detective Cha’s death and visit Director Baek’s house only to realize that Hee Seong and Hyun Su are together.