Something true of every high school in the world is that people who share the same name would get special monikers, at least Jeno would assume. 

Like at Jeno's school there were two Jaemins. One was rich Jaemin and the other was sleazy Jaemin. 

Rich Jaemin is rich, of course, and the entire student body hates him and/or wants to sleep with him, the kind of student whose father has the football field named after him because he paid for it. 

Sleazy Jaemin is sleazy; meaning he drinks a lot and sleeps around. Not in the popular kid way but in the, you know, the sleazy way, the way that makes other students grossed out or feel bad for him. He's the kind of sleazy that has the teachers whispering behind his back about wasted potential, showing up to school three times a week with hickies and no pencil.