An unexpected marriage brings jewelry designer Su Qiangwei into the wedding bed of Fu Chenzhou, an upstart in the business world. In order to repay the huge gambling debt owed by her stepmother, she was forced to sign a two-year hidden marriage contract. "The first rule of marriage," the man put the diamond ring on her ring finger, "played the role of a loving couple outside, and kept a three-meter distance inside." But when she was framed for plagiarism, it was him who called surveillance cameras late at night to clear her name; when she was kidnapped, it was he who broke three of the gangster's ribs with his bare hands; when she huddled in the rainstorm and shivered, it was he who used his body temperature to smooth out all the nightmares. It wasn't until one night when she was drunk that she bumped into her usually stern husband, who was frowning at the pregnancy guide and taking notes. She discovered that on the back of the contract, there was actually a third clause he added with a pen: "If Party A is tempted first, the contract will automatically become valid for life."