On the day of Grandma's eightieth birthday banquet, Shen Zhiyao accidentally "sees danmu" and sees through the adultery trap set by sister-in-law Gu Shanning to fight for the commercial shop in the south of the city in advance. As evidence such as old mobile phones, forged chats, hidden camera videos, buying off waiters, and hiring people to make trouble gradually surfaces, this scheme originally aimed at her marriage and reputation ultimately pulls out the long-accumulated interest imbalance and control relationship inside the Yu family.