Officer Black Belt

Lee Jung-do, a black belt in martial arts, works as a delivery rider and spends his free time gaming with friends. After helping probation officer Cho Min-jo subdue a violent offender, he is invited to become a "martial arts officer," partnering with Kim Sun-min, who becomes like an older brother to him.

When the offender is released on parole, Jung-do and Sun-min are assigned to monitor him. Despite their efforts, the offender continues his criminal activities. Jung-do and Sun-min face serious challenges that test their courage and resilience.

While Sun-min is recovering, Jung-do decides to team up with his friends to stop the offender and his accomplices. Their journey leads to an exciting confrontation, strengthening their bond as a team.