Mook, a single mom with five girls, wants to marry Tum, a widower with two kids. But all of her daughters are strongly against his family. Especially Petch, the stern eldest daughter, whom Mook is afraid to confront the most.
Both families agree to try living together for one year. If none of the family members have problems, then Mook and Tum can get married. Soon enough, Tum gets uncomfortable with Pailin. While Praewprow dislikes Baby since they first met.
Petch starts wondering if Boom has feelings for her more than just stepsiblings. Meanwhile, Ploy is getting nervous when Mark, her classmate who is also a superstar has to frequently visit her to work on a project together.
Tum becomes nervous when he gets to meet Mook's ex. Petch gets uneasy to confront Boom after forbidding him from having feelings for her. Ploy wonders if a hot superstar like Mark'd be interested in a plain-looking girl like her.
Pailin gets so annoyed with Tum and moves to live with Poom. Petch and Boom fall head over heels in love while have to keep their relationship a secret. Things get more complicated when Tawaan starts to have feelings for Boom.
Petch is trapped in a dilemma, when Boom wants to tell Tum and Mook about their relationship; while Tawaan admits to Petch that she has feelings for Boom.
Mook visits Dao and invites Petch and Tawaan to go with her. Petch finds herself in awkward situation when Tawaan takes Boom along. Tum gets curious about Paiin and Sai's relationship.
Mook and Tum arrange a countdown party. Ploy feels let down when Mark cannot come due to his work schedule. Petch tries to be friends with Boom. But Boom rejects her.
After Tawaan left, the house that used to be warm and lively, it's now filled with gloom. Mook and Toom notice the discomfort between Petch and Boom that becomes more and more intense.
It's been three months after Mook and Tum broke up. Tawaan left to her hometown and hasn't returned. Mook's birthday has come round again. Reminding them about last year when they all got to meet Tum's family for the first time.