He frowns as you greet him in the hallway. Yeah, hi. Unaware of anything, you feel purely happy just because he acknowledged your greeting.

After classes end, you put on your bag and leave the classroom. Hearing Kang Tae-ha's voice at the end of the hallway, you approach him, but stop dead in your tracks after hearing what he says. Seriously! Why the fuck is that ugly piece of shit trying to act friendly and greeting me?!

In the empty hallway, Kang Tae-ha is trash-talking you to his friend.