1x1 - Just Another Meaningless Day

August 9, 2021

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.

1x2 - Sun-ho Meets Dong-man Again

August 10, 2021

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.

1x3 - Nothing Is Impossible

August 16, 2021

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

1x4 - No Hard Evidence

August 17, 2021

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.

1x5 - The Duo

August 23, 2021

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.

1x6 - The Blackout

August 24, 2021

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.

1x7 - The Disappointment

August 30, 2021

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.

1x8 - The Culprit

August 31, 2021

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.

1x9 - The Confession

September 6, 2021

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.

1x10 - Sun-ho’s Investigation Team

September 7, 2021

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

1x11 - The Case Closed

September 13, 2021

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.

1x12 - The Enemy Within

September 14, 2021

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.

1x13 - Sun-ho’s Counterattack

September 27, 2021

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.

1x14 - The Ledger

September 28, 2021

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.

1x15 - The Head Operator Of The Zelkov

October 4, 2021

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

1x16 - The Hacker Sun-ho

October 5, 2021

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.

1x17 - Episode 17

October 11, 2021

1x18 - Episode 18

October 12, 2021

1x19 - Episode 19

October 18, 2021

1x20 - Episode 20

October 19, 2021

1x21 - Episode 21

October 25, 2021

1x22 - Episode 22

October 26, 2021

Cha Tae-hyun

Yoo Dong-man

Jung Jin-young

Kang Seon-ho

Krystal Jung

Oh Kang-hee

Hong Soo-hyun

Choi Hee-soo

Lee Jong-hyuk

Kwon Hyuk-pil

Seo Ye-hwa

Baek Hee

Choo Young-woo

Park Min Kyu

Yoo Young-jae

Jo Joon-wook

Choi Yi-sun

Seo Yeo Joon

Kang Shin-il

Seo Sang-Hak

Song Jin-woo

Park Cheol-Jin

Yoon Jin-Ho

Team Leader Choi

Yoo Tae-woong

Han Jung-Sik

Yu Tae-woong

Han Jung-Sik

Shin Seung-hwan

Professor Go Deok-Bae

Oh Man-seok

Yoon Taek-Il

Choi Woo-sung

Yoon Seung-Beom

Kim Young-sun

Oh Jung-Ja

Byeon Seo-yun

Lee Eon Ju