When I opened the first page of my diary at the end of that year, in a few seconds it would be when you and I met.
Fang Wansheng wrote a diary with him. When cleaning the house at the end of the year, she accidentally found Fang Wansheng's diary. For some reason, or in parallel time and space, she met 16-year-old Fang Zhisheng. Looking at Wansheng's description of him on the top of the diary, she found that she had gradually fallen in love with the Fang Zhisheng who lived in the diary.
Concept: Love in the diary