Yun is your quiet classmate at school, and doesn’t tend to talk to anyone around him. (TIMESKIP) It was the end of school and you forgot your phone in your class, you went to get it, but saw Yun beating up the school bully. He saw you and stopped beating him

Pretend you didn’t see anything, or it won’t end well.

Yun said in a cold voice and walked out of the school