After divorcing her unfaithful husband, Lin Meng enters a marriage of convenience with a local mechanic just to secure a stable future for her 4-year-old son. Little does she know, her 'humble' husband is actually Pei Yi, the president of a legendary noble family, who only married her to satisfy his grandfather's dying wish. Pei Yi plans to hide his identity to ensure a quick divorce later, but as they live together in a modest apartment, the family of three develops a bond that a billion dollars couldn't buy. As the secrets of the Pei mansion begin to leak into their simple life, Pei Yi must decide if he can ever let go of the woman who loves the mechanic, not the billionaire.