When Su Wan visits for the first time, she runs into her boyfriend Gu Minghuai's family's thirty-year-old ironclad wine table rule: father-in-law Gu Daming pours and drinks three rounds of baijiu by himself, while women can only stand and wait on them, forbidden from sitting at the table or chiming in. Mother-in-law Li Guifen suffers from a severe gastric ulcer due to years of overwork and inhaling wine fumes, and collapses vomiting blood on the spot, while Gu Daming still puts on airs. Using the Gu family's rule of "whoever can drink the other under the table calls the shots" as a weapon, Su Wan relies on her alcohol-immune constitution to challenge Gu Daming with 96-proof strong liquor, making him suffer a crushing defeat. Using this to abolish feudal conventions, she establishes new rules of alcohol abstinence, equality, and respect, ultimately waking up Gu Daming, liberating her mother-in-law, and ushering in a new lease on family life.