I'm the mafia brother

Choi Yeonjun, an 18 years old highschool boy, has a good reputation at school, is always on top in his school, has a part-time job at a local convenience store, and is a very loving person suddenly being interviewed by the secret government agent for the biggest case of drug ...... is he a bad guy in secret, who knows, he might be or just read the story and you will know :)