Kim Sunoo and Park Sunghoon have always been neck-and-neck-top grades, top rankings, top rivals. To everyone else, they're sworn enemies, constantly trying to outsmart, outshine, and outdo each other. But behind closed doors? Let's just say "top of the class" isn't the only thing they're competing for. What starts as late-night study sessions filled with snark and bickering slowly unravels into something messier, softer, and infinitely more dangerous: feelings neither of them can afford to have. After all, there can only be one at the top... right? Warning this will contain lots of cussing and mature scenes so read at your own risk! Rankings: #1 sunsun