Kim Dong-Chan (김동찬)

Kim Sang-an, a cold-blooded loan shark. When his sister, a school teacher, takes her own life after being relentlessly tormented by her students... He becomes their new homeroom teacher to collect the "debt" of her life. A debt collector who would crawl into the depths of hell to get what's owed, and students who are nothing short of demons. A brutal "teacher-student" relationship begins now.

After being bullied in middle school, Choi Baekho succumbed to the violence, destined to live out his middle school days in anguish.During a particularly vicious attack by his bullies, his life flashed before his eyes, causing him to 'Switch’, giving him the power to overcome them...Ever since that day, Choi Baekho was the most feared bully of them all, so much so, that he became known as the “Grim Reaper” of the group. Beating up anyone who spoke poorly of him.That was, until Do Changsu arrived….Links:Original Webtoon (Kakao Webtoon)