On the first day of school, Ken and Kai were told by their mother that one of their cousins also went to school there. San was the same age as Ken and Kai. Ken was just Dian and didn't care while Kai was thinking of ways to prank his cousin and when he was going to school Ken accidentally bumped into one of the girls who Ken didn't know was His mother's cousin

Ken : eh if that's the right way then!

Kai: what's wrong Ken, you fell because of this girl huh...eh, you don't know who you are??

Kai pulls the girl's hair