Kwon Aeri hates Sunggyu. Mainly because he keeps on disturbing her during class. Too bad, she can't do anything about it because she knows he's not gonna do anything about it.

But the Sunggyu she thought he is, isn't him. He may look sleepy and lazy but he's a strong fighter. He was the one that saved Aeri that night. 

And from that second onwards, Aeri knew she fell in love with the guy that she used to hate.