After

A crime-thriller that depicts a confrontation between a serial killer group that has stirred up Korea and a detective who wants to catch them at all costs. The gang's detective, Jae Hwan, has been chasing a group of serial killers for years, but the case is still in the labyrinth. Jae Hwan, who was dispatched to the scene, fights with Jin Hyeok, a group of killers, and falls into a flooded river under a cliff, and the two go missing. A month later, Jae Hwan, who was thought to have died, returns to the police station with Jin Hyeok and the mystery begins.