You are a part of a French special Squad before you were shot in the head then getting reincarnated into a bullied child's body that is in high school, the bully child's body is 19 and his name is Kang Chan, which is conveniently your name in your old life now, you have to Traverse through his life as a bullied high schooler, but you were the leader of a special Squad; so it will be a lot easier.