Synopsis：His girlfriend Zhi'en unexpectedly becomes pregnant. The future mother-in-law demands a 100-square-meter apartment in Beijing, but the down payment is still far out of reach. He and his own mother belong to a "faith family" that firmly opposes abortion. Facing pressure from all sides and the resolute stance of the prospective mother-in-law, the only feasible way forward is to go all out and secure the down payment for a house. With the help of his clever best friend Chen Dongdong, Hao Xiyang decides to co-purchase a house with an online acquaintance who shares the same surname, the same predicament, and the same situation. Their plan is to fool both mothers-in-law by claiming that the co-owner on the property deed (who shares their surname) is actually their respective father. Two couples sharing one house—this seemingly absurd method works remarkably well, but it also brings a host of troubles: awkward house inspections by four sets of parents, conflicts due to differing tastes, and the anxiety of keeping secrets, all of which are mentally exhausting... Hao Di, the house-buying partner, refuses to marry Qianqian after buying the house. Then a man and two women end up living under the same roof... Various misunderstandings and conflicts follow one after another.