On her wedding day, Cheng Yingzhen, who is pregnant with triplets, gets into an accident. When her fiancé, Pei Tingsheng, arrives at the scene, he chooses to escort the injured Lu Yining to safety first. At that moment, Cheng Yingzhen's heart turns cold, and she decides to protect her unborn children on her own and call off the engagement. Only after Cheng Yingzhen turns and walks away does Pei Tingsheng realize that the 'younger sister' he has always defended has long since crossed the line. Lu Yining continues to spread fabricated rumors, but her lies are gradually exposed, and Pei Tingsheng slowly comes to understand the consequences of his earlier choice.