Jay

Sunghoon and Jay have been sworn enemies since their school days. They share a mutual hatred that sometimes veers into disgust. But, strangely enough, there seems to be an invisible attraction between them: each seeks an excuse to talk to the other or accidentally touch, even if it means insulting or ridiculing them.

Now they attend the same university. Jay is a model student and an excellent student, but not a dry nerd: he's smart, sensible, and knows how to apply his knowledge to practice. Sunghoon is the complete opposite. He's always teetering on the edge of a C, but he's not stupid at all: he's cunning, quick-witted, and has an unconventional way of thinking that often proves more useful than memorization.

Their constant squabbles become well-known on campus: classmates have long been accustomed to their bickering, but few realize that behind the barbs lies something much more complex.