Just read chapter.
Yep! ^^
The guy in the beginning of the chapter (black hair - Class Rep, Sungkang) or end (white/blue hair - Onyu)?
It's revealed pretty much in the beginning chapters so you'll find out soon!

The other characters seem to be so enamored with her for some reason, but she hasn't really shown any personality or charisma yet at all. Hopefully we'll get some more character development soon, so I can change my mind about her. 