When Song Zhiyi, an ancient book restorer, was sorting out old letters, he discovered Shen Qinghe's unsent love letter from the Republic of China. In order to find the owner, she met Shen Muyan, Shen Qinghe's grandson. The two explore the regretful love of their ancestors, and gradually fall in love, but encounter secrets revealed and the pressure of reality. Can they overcome the barriers of time and space, continue the unfinished fate of their ancestors, and write a love letter of their own time?
