Lin Zhixia, an ancient book restorer, accidentally discovered an unsent letter from the Republic of China while sorting out the old books left behind by her grandmother. The vague invitation in the letter was like a spell, pulling her into a repetitive time trap - every midnight, she would return to the morning when she found the letter. In order to break the cycle, Lin Zhixia had to repeatedly read the details of the letter, and traveled through the old house where the lingering charm of the Republic of China intertwined with modern light and shadow, but found that behind the trap, there was an unresolved obsession between her grandmother and a strange man that spanned hundreds of years.
