A Sense of Play

Vice president Lee Myung-joon of Hyun-do Group lost his daughter because of bullies.
He adopts Yoon Ga-ram, a psychopathic defector from North Korea, to revenge her.

Yoon Ga-ram is
a sadistic human weapon born from North Korea’s drug experiments.
She killed everyone in the research lab and defected alone.

Yoon Ga-ram, who has just been released from a juvenile detention center in South Korea, goes to school to hunt bullies.
It was for revenge against his stepfather who had taken him in, and for his own sadistic gratification.