S1 • E1
Ji Hyeong-min has been put in charge of a special unit to take down the drug lords of the city. Jung Shi-hyun is tired of the way his boss is treating him and decides to take him down.
S1 • E2
Complications arise as Shi Hyun takes over Scale's organization.
S1 • E3
S1 • E4
S1 • E5
S1 • E6
S1 • E7
S1 • E8
S1 • E9
S1 • E10
Doctor's Son finds out that a gang member is actually an undercover agent.
S1 • E11
Team Leader learns compassion from an unlikely source.
S1 • E12
The gang is divided after finding out that Safari is in fact a police officer.
S1 • E13
Everyone is trying to find out if a dead guy is Doctor's Son. Yoon Soo Min's affection for "Mr. Gangster" puts her life at risk.
S1 • E14
Doctor's Son learns a startling truth about his deceased mother.
S1 • E15
Team Leader Ji discovers he can't trust his own police officers.
S1 • E16
Doctor's Son asks Team Leader Ji to help him find Gyung Mi's killer.
S1 • E17
Doctor's Son tries to enact revenge on Chairman Jo, but Team Leader Ji arrests him before Doctor's Son can kill him. Chairman Jo is released on sick bail, much to Team Leader Ji's disappointment.
S1 • E18
Yoon Soo Min decides to get revenge for her sister's death by killing Doctor's Son. Knowing that Doctor's Son didn't kill her sister, Team Leader Ji tries to stop her.
S1 • E19
In this thrilling episode, Doctor's Son discovers that Min has been lying to him his entire life. Undercover agents, police officers and drug dealers are involved in a shootout that quickly escalates.
S1 • E20
In this series finale, Min reveals that Doctor's Son is actually an undercover agent to his criminal friends. After Team Leader Ji finds out about Doctor's Son's secret, they work together to catch Min.
Jung Shi Hyun
Yoon So-min
Min Hong-ki
Kim Hyeon-su
Detective Squad Chief Yang
Jeo 'Scale' Woo
Prosecutor Ahn Kyeong-chan
Kim 'Meth' Bbong