A story about two bestfriends since they were little. A guy named Himchan has a girlfiend named Neul & a cold-hearted guy with a serious case of ego named Yongguk. They're like water and fire, different in every way.

Fate changes everything when a beautiful girl from America, named Hyerin, shifted to their highschool and unknowingly steals Yongguk's heart. Himchan starts to get jealous of Yongguk.

Will they be able to remain as bestfriends until the end or will things between them become worse.