Officer Black Belt(무도실무관)

Lee Jung-do spends his days playing video games with friends and delivering food from his father's fried chicken restaurant. A blackbelt in taekwondo, kendo, and judo, Lee Jung-do comes to probation officer Cho Min-jo's aid, when Min-jo is reprimanded a probation violator. The two team form an unlikely friendship and work together to keep tabs on probation violators.