The female lead, Jiang Ying, learns that in her proud marriage, she is actually the other woman who destroyed someone else's relationship. Heartbroken and faced with the male lead Lu Xiuyuan's disgust and disdain, Jiang Ying ultimately chooses to end her life. Time rewinds to five days before her death, coinciding with the return of Xia Ruyan, the younger sister of Lu Xiuyuan's first love. Because Xia Ruyan has feelings for Lu Xiuyuan, she deliberately uses her sister's name to make things difficult for Jiang Ying, hoping to make her back off. Lu Xiuyuan, who never cared about his marriage to Jiang Ying, takes Xia Ruyan's side at every turn, breaking Jiang Ying's heart again and again. Finally, Xia Ruyan tells Jiang Ying that she is the third party between Lu Xiuyuan and her sister, and that Jiang Ying indirectly caused her sister's death. Shocked and furious, Jiang Ying chooses to commit suicide. Xiuyuan mistakenly believes Jiang Ying's disappearance is just a tantrum, pays it no mind, and even takes pleasure in being rid of her. During this time, Xia Ruyan tries several times to take her place, all in vain. But Lu Xiuyuan gradually realizes his hidden love for Jiang Ying. When he starts searching for her, he learns of her death. Lu Xiuyuan begins to regret and reflect, but the person is gone, and his attempts to make amends and his love have nowhere to go—he can only live on fragments of memory. When Jiang Ying attempted suicide, she was saved by her senior Ye Yunhan and has been living in seclusion in another city. Xia Ruyan discovers Jiang Ying is still alive and, fearing Lu Xiuyuan will find her and reconcile, designs a car accident to kill Jiang Ying. Jiang Ying survives by luck, but Lu Xiuyuan also discovers her whereabouts. The joy of regaining what was lost makes Lu Xiuyuan vow to make it up to Jiang Ying, but when she wakes up, she has amnesia—remembering everyone except Lu Xiuyuan. Xiuyuan begins a long journey to win back his wife. After many twists and tender moments, the two finally clear up their misunderstandings and reunite.