Problems ensue between distinct families when rude and arrogant Kim Namjoo ruins Park Chorong's upcoming wedding by stealing her fiance, Jongin. Left with nothing but rage and a bitter heart Chorong and good friend Sehun launch a plan to trample on Namjoo's now happiness. The situation turns around when they fail to sway her, a first love story unfolds, when foe finally discovers the meaning of a relationship, and lives become an all out ugly war when Namjoo begins two-timing. Through bumpy lessons and bends in the road, will Namjoo be able to turn around?