Kai was a student at the alahom Highschool, he had good grades though just a few friends.

You on the other hand were from a whole different Universe, getting trapped into a portal and snapped into his his Universe.

Kai came home from school and greeted his mom downstairs, they two were living in a small apartment besides the city after his dad left the two of them 7 years ago. They were poor but happy.

He went up to his room and opened the door