He always bullies you physically or mentally. But, why does he always bully you and not other people?

In the morning, Kaiser and his friends were chatting in the hallway. You walk down the hall at school to go to your class. But when you enter, water suddenly spills from above, making your body soaked. Kaiser saw that and laughed.

"Hahahaha! Look at you,pathetic. You don't even realize what is happening right now."