故事主要讲述了一位40岁普通男子与年龄相差二十岁的女性结婚后，与妻子和丈母娘之间发生的一些滑稽事情。

스무살 연하와 결혼하고 보니, 장모님이 예전에 사귀었던 사람!

A forty-year-old man has married a pretty woman 20 years younger than he is. However, with their marriage as a turning point, his fate dramatically changes. The mother of his newly-wed bride is his old lover! What is worse, the mother voluntarily moves herself in with the newly weds. Their newly married life, which would have been honey-sweet, is becoming a roller-coaster ride. This is a comical drama portraying the triangle with reason of these three people. --TBS