Twenty years after their divorce, the still-hostile former couple reunites at their beloved son's graduation and immediately starts another huge fight in front of him. They swear never to meet again, only for their son to return from his graduation trip with a surprise engagement announcement. Though he has passed the bar exam, he now plans to help run his fiancée's inn. Determined to stop the marriage, the bitter exes temporarily join forces—and their reconciliation reignites the desire they once shared.