Plagued by insidious thoughts planted by serial killer Lee Joon-yeong and recent events, Lee Hyun's father believes that he is becoming a monster. He isolates him in the basement to protect both him and the world. Joon-yeong escapes from prison, murders his father, and absconds with his brother. Lee Hyun discovers a painting at a murder scene that he believes may be his brother Lee Min’s.
수사요청을 하기위해 현을 찾아갔던 지안은 다음 살인에 대한 결정적 단서를 발견한다. 한편 현은 성큼 다가와 있는 그의 존재를 느끼는데..
