One day, 13-year-old Rong Yi found a brand new mailbox on the roadside with the words "Time Post Office" written on it. It happened that the teacher had assigned an assignment of writing a letter to herself ten years in the future. Out of curiosity, Rong Yi put the written letter in. Unexpectedly, she received a reply a few days later. It was really from her 23-year-old self. The 23-year-old seemed to have more worries. She looked forward to her 23-year-old self, and she also missed her 13-year-old self, but through letters again and again, they were like friends moving forward hand in hand, finally able to forget about the past and not be afraid of the future.
Concept: Time is not an island, memories and longings accompany the present together