
Youthful Mother In Law is a daring cohabitation story between a young mother-in-law and her son-in-law. Mother-in-law~ Don’t let your father-in-law or wife know! Seon-yeong and Do-han have been married for 3 years. Due to a business failure, Do-han lost his entire family and was forced to move into Seon-yeong’s father’s house, who lives alone. No longer attracted to her husband’s incompetence, Seon-yeong started going to clubs and had an affair with Jeong-hyeon, whom she met there. Seon-yeong was drunk or didn’t come home every day, but Do-han didn’t say anything and only felt more resentful. One day, Seon-yeong received news from her father, who was on a business trip, that her future stepmother would be coming to the house. Kyung-mi, the young stepmother, came to their house first because Seon-yeong’s father’s business schedule was extended. She met Seon-yeong’s father at work and had planned to remarry and live together, but because her father’s schedule changed, she came first. Seon-yeong does not welcome Kyung-mi’s appearance, and when Kyung-mi sees Do-han being ignored by his wife, she comforts him and tries to seduce him to make him hers. The awkward and dangerous cohabitation of the three, young stepmother, daughter, and son-in-law, begins.