Freshly divorced, Hyun-woo is enjoying his newfound freedom, until he is forced to come face-to-face with his ex-wife once more. Yet fearing that he’ll find himself falling back into the same old routine of their terrible married life, he does his best to stay away from her at all costs. However, all that changes when a new man enters her life, which awakens his jealousy. But that jealousy ramps up when he discovers that his ex-wife’s new beau is none other than his old high school rival.