The discovery of an unidentified human skeleton raises unsettling possibilities; Dongsik drags Kang Min-jeong back to town from a Seoul night club.

Manyang is filled of horror and sorrow after multiple murder cases; Dongsik's actions are suspicious during the investigation, placing Juwon in a difficult position.

Juwon tries to find the critical evidence to confirm a theory; Dongsik gets help from an unexpected person; public opinion against the investigation maddens Juwon and Dongsik.

Juwon's press conference shocks the world, but the situation doesn't favour him; Haewon and Changjin take on an event featuring Jinmook, who lost his daughter; Juwon threatens Dongsik with a new secret.

Jinmuk asks to carry out his own, unofficial investigation; Dongsik and Juwon continue to investigate the case; Haewon seeks to protect her son.