My Rival is Son-in-law, My Lover is Son-in-law(我的情敌女婿)

An ageing bachelor playboy finally meets the girl of his dreams and proposes marriage, only to discover her psychologist stepmom was his first love long ago. The future in-laws initially pretend not to know each other but as the wedding date gets nearer, the rekindling of long-dormant feelings develops into a cross-generational love triangle.