I DON'T KNOW GUYS. 

HE JUST LOOKS LIKE SEHUN. 

http://mangafox.me/manga/faster_than_a_kiss/v10/c055.5/15.html

I DON'T KNOW WHY.

He just seems like A SEHUN. 

AND if you read the story. His character is like what an immature Sehun would do.