Detective Novice - Season 1 Episode 5
Overview: On Kai and Jiro’s first day out after their probation period, they show up at a club in the middle of a drug bust. Later, they learn that the police is chasing after the ringleader of the drug dealers, who also turns out to be Jiro’s childhood friend. The police asks Jiro and Kai for help, and thus they go on their first undercover mission.