Su Mian was once trapped in a draining five-year relationship with Jiang Cheng. On the eve of their marriage registration, Jiang Cheng became increasingly temperamental, constantly belittling and putting her down until she finally lost hope and walked away. Years later, Su Mian has built a successful career in the event planning industry and enjoys her independent, peaceful life. One late autumn day, the two unexpectedly meet by the seaside, where Jiang Cheng has finally let go of his obsessive past and found peace. Later, when others at a banquet encourage them to get back together, Jiang Cheng takes the initiative to make it clear that they are no longer a couple. After eighteen years of entanglement, their relationship comes to an end. They remain business partners, while Su Mian embraces her fulfilling single life and makes peace with her past, each moving forward on their own.