Just Another Meaningless Day

Yoo Dong-man goes undercover to root out illegal gambling. Kang Sun-ho steals money from criminals to pay for his father’s cancer treatment.

Sun-ho Meets Dong-man Again

Oh Kang-hui witnesses her mom’s arrest. When training begins at the university, Dong-man appoints Sun-ho a leader, set on flunking him.

Nothing Is Impossible

Determined to bring victory to his team, Sun-ho asks Dong-man for advice. The final assignment comes with a twist.

No Hard Evidence

Sun-ho gets grilled in class. Kang-hui’s personal life is made public on the school website. Dong-man feels out the police chief.

The Duo

Dong-man grows suspicious of a fellow professor. With Sun-ho by his side, he scopes out the scene of the crime to check out an alibi.

The Blackout

Another potential culprit appears on Dong-man’s radar. Sun-ho struggles to remember the events of the night before. The campus hosts a field day.

The Disappointment

Sun-ho finds Park Cheol-jin suspect, but Dong-man is determined to keep him off the watch list. Kang-hui attends her mom's trial.

The Culprit

Cheol-jin finds himself in an even deeper rut when he's cornered by Sun-ho and Dong-man. A cheating scandal breaks out during the final exams.

The Confession

Cheol-jin falls into a trap. Dong-man takes a closer look into Ko Deok-bae’s business. Kang-hui insists on joining Sun-ho in the investigation.

Sun-ho’s Investigation Team

Sun-ho and his friends track the location of the burner phone. The professors step in to protect their students from further danger.

The Case Closed

Sun-ho gets Kang-hui a gift, but hesitates to give it to her. A critical piece of evidence is missing. Dong-man spots a colleague at the precinct.

The Enemy Within

Sun-ho’s criminal history comes back to haunt him. Learning of Choi Hui-su’s connections to the case, Dong-man leans on his gut and tails her.

Sun-ho’s Counterattack

Sun-ho acquires a key to a safe, Kang-hui calls it quits and Dong-man gets eyes on the chief. Stronger curfews and regulations are enforced on campus.

The Ledger

With his hands on the ledger, Dong-man is sure that he's pinned down the culprit. Sun-ho gets arrested for conspiring with Jang Jae-gyu.

The Head Operator Of The Zelkov

The police look for incriminating evidence against Han Jeong-sik. The truth behind the foundation finally comes to light.

The Hacker Sun-ho

Sun-ho completes one final hacking job before dropping out of school. He turns himself in for his past crimes so he can return with a clean slate.