When Mook, a young-at-heart single mother, and Tum, a kind-hearted widower, fall madly in love, they decide to get married. However, they completely forget that Mook's five high-spirited daughters do not know about their relationship, yet. Mook then invites Tum and his kids, Boom and Baby, to her home to celebrate her birthday. She hopes that both families can get to know each other better. Mook ends up getting more in trouble when all of her daughters are strongly against Tum's family. Especially Petch, the stern eldest daughter, whom Mook is afraid to confront the most. What are they going to do now? Will Mook and Tum be able to get married?