This is Daeun from 2Eyes. she is Sehun's best friend from school.

Sehun had to un-follow his best friend because a lot of "fans" are freaking stupid and immature and the "fans" who sent her hate on instagram just because she followed a friend,they need to grow up!

I suppose something will have to be taken away from them (exo deleting their insta's) in order for them to do so.