Overview
Jang Choon-dong is a traffic officer who aspires to become a homicide detective. He is assigned to go undercover to infiltrate a gangster network. Meanwhile, Lee Joong-dae, a member of Kwang-seob's gang, goes undercover himself by joining the police force. Joong-dae tries hard to gain favor with his squad leader in an effort to expose Choon-dong's identity.
| Actor | Age then | Age now | |
|---|---|---|---|
 | 38 | 54 | |
 | 39 | 55 | |
 | 33 | 50 | |
 | 33 | 50 | |
 | 43 | 60 | |
 | 46 | 63 | |
 | 38 | June 29, 2019 (48) | |
 | 38 | 54 | |
 | 36 | 52 | |
 | 26 | 43 |