Xie Huai has secretly loved Song Nuan for thirteen years and has finally married the girl he adored throughout high school. Due to a series of childhood traumas, he developed depression, and his father was only willing to grant him a three-year marriage agreement. Song Nuan, a lawyer, agrees to marry him under a contract, believing it to be nothing more than a transaction. However, his daily acts of cooking, mending her bag, and accompanying her with endless tenderness gradually win her heart. This man, who treasures her more than his own life, inspires her to tear up their agreement voluntarily. What begins as a marriage of convenience blossoms into mutual love. When he is diagnosed with early-stage lung cancer and she unexpectedly becomes pregnant, the two face surgery and treatment together. They eventually hold their wedding, while his depression gradually improves through love and companionship.