During the Republic of China, Qin Jiuxuan and Lin Youxi remembered each other because of their agreement in a small town. That pocket watch carries the most sincere feelings between them. In Shanghai, they met again, but it was at Qin Jiuxuan's engagement party. Qin Jiuxuan didn't seem to remember the girl he had promised to take care of for his whole life. Finally, they broke through the shackles of family and staged the final ending of their lives on the top of the church in the middle of Shanghai in their most beautiful years.