Nobody Knows

Young Jin and Soo Jung are good friends, but Young Jin ignores Soo Jung's calls one day.

Jin Young finds Sang Won, the culprit of a serial murder case. Eun Ho receives an award for his good deed.

Eun Ho gives the money he had kept in a pair of sneakers. The recipient is none other than Dong Myung.

Young Jin thinks of it as a criminal case and starts investigating the traces he left, and Sun Woo accompanies her.

Dong Myung goes missing. Young Jin and Sun Woo try to track down Dong Myung as soon as possible.

Young Jin knows whose money Eun Ho took from the hotel. Sun Woo finds out about Min Sung's sins.

Young Jin notices something is od around Eun Ho, and it's related to the Sang Won who died.

Kevin is involved in the drug deal at the Millennium Hotel. Superintendent Han and Sun Woo visit Min Sung.

Young Jin realizes that Eun Ho fell due to the stuff of Jang Ki. Jae Chun has been hiding Ki Ho.

Sun Woo finds a decision-making clue just at Millennium Hotel's rooftop. He realizes Eun Ho jumped to survive.

Eun Ho regains consciousness. Unfortunately, he doesn't remember a thing from the past month.

Eun Ho starts to regain his memory about the past month, just as So Yeon meets with Chairman Yoon.

Eun Ho tells Young Jin about what he witnessed in Sang Ho's study in the hotel. He admits about his parents.

Eung Ho tells Young Jin everything that he remembers. Young Jin is sure that Sang Ho is definitely the killer.

Secrets are revealed. Sang Ho killed Jung Ki. Arrests are made one by one because of the detectives' leads.

Sang Ho breaks into Eun Ho's ward. A threat towards Eun Ho's mother's life arises. Sang Ho gets confronted.