A police officer was severely traumatized by the murder of his four brothers and decided to become a high school student and go undercover in a high school to find the gangsters who killed his brothers and bring them to justice.
But things were not as simple as he imagined. Not only did he make a lot of dumbfounding jokes. He also caused a farce of happy enemies with the headmistress.
But many obstacles could not stop him from finding the murderer. He swore to God that no matter what happened, he would avenge the four dead brothers even if he died.