In the mysterious post office that only appears on rainy nights, the 12-year-old girl Xiao Yu, the writer Amo who lost his beloved, and Granny Lin who is full of memories, through letters spanning time and space, find the missing answers, repair the unresolved regrets, and finally reveal the ultimate secret about love, memory and time behind the post office.
Concept: In the folds of time, every unsent letter is an unfinished farewell, and the real encounter is not in time, but in the hearts of people. This novel explores the intertwining of time, memory and emotion. Through the fantasy setting of the post office on a rainy night, it allows people to rediscover the forgotten warmth between the passing and the yet to come. It reminds us that regret is not the end, and every letter and every thought will eventually find its destination.