After seven years together, Xu Yan prepares a diamond ring to propose, but his girlfriend, Tang Xuening, insists on having a child through IVF with her gravely ill first love, even going so far as to want to use his kidney to save him. After years of humble devotion are callously trampled on, Xu Yan finally loses all hope. Remembering a childhood promise he made with his childhood sweetheart, Lin Miaomiao, he sends an email that opens the door to a new relationship. Xu Yan decisively cuts ties with his past and finds mutual love with Lin Miaomiao, who has secretly loved him for years. The two get married. Tang Xuening finally realizes her mistakes and desperately tries to win him back, but it is already too late. In the end, she suffers the bitter consequences of her actions and is left in a miserable situation, while Xu Yan finds complete happiness and a loving family.