In order to complete the renovation project of the old city, architect Lin Zhiyi met Gu Yu, who runs a bookstore in a century-old house. The two became connected through an old book and were attracted to each other during the process of restoring the old house. However, Gu Yu's dusty past, Lin Zhiyi's abandoned heart, and the test of reality followed one after another. In the end, they sent each other the most sincere "love letters" from their hearts.
