For 15 years, Kim Yoogyung has been growing up and playing with Hong Jisoo and Lee Seokmin. They witnessed each other grow up and become different people, become ugly through their hormonal stages, saw each other ride their roller coaster life ride. On Valentine's Day when they were 19, things became different for them. It was no longer friendship, but a newfound war between them.   

Jeon Wonwoo swore never to make any friends. Months into that promise, the school organises their annual Evaluation Project, that has to be done in pairs. His partner is none other that the amiable, famous, talented nemesis - Kim Mingyu. Given their past, and their present, how would their future be like?          

No one knows what he's going through. No one knows how he really feels. All they wanted was to see that they were happy, so no one noticed the aching heart in him that was concealed by the smile on his face.  He could take only this much, he could endure only this long.  Now, it is time for him to let all this go, and put an end to this predicament.  This is