Xu Lingyi grew up in the Xu family, only to discover at a family reunion that she was the fake heiress, having been switched at birth. Her biological family favors their real daughter, while the Xu family coldly abandons her. With nowhere else to turn, she impulsively registers her marriage with Fu Qinyan, a man she has met only once. Fu Qinyan is a leading cardiac surgeon in Beijing's elite circles. Cool and reserved, he rarely speaks, yet he gives her all his affection and preferential treatment. When the Xu family repeatedly makes things difficult for her and the real heiress schemes against her at every turn, Fu Qinyan stands up to them all. Their marriage certificate becomes her strongest shield. After twenty-three years of being switched at birth, she thought her life would be filled with regrets. Little did she expect that, after marriage, Mr. Fu would cherish her like the apple of his eye.