The young psychopathic killer is the homeroom teacher of Jumin and Jihoon Kim at Sorae High School. He is the son of Min Ji Yong. His name was changed to Lee Min-soo. His former name was Lee Yun Song. He underwent surgery to implant a pacemaker due to poor heart function due to a congenital heart defect. He's a clever hacker. He is characterized by an extroverted, intuitive, thinking and insightful personality. A pedophile likes to take risks. Min Soo's students consider him the best teacher. 