When I took the letter that you entrusted your sister to send, I decided: I will wrap your and my feelings with the most beautiful lotus leaves in the lotus pond at the end of the village, tie a red silk thread, and keep it in our hearts temporarily until a suitable tomorrow, we will open it together. Time goes by, and the laughter and sorrow of the past seem to have passed away with the wind. Although it was only once, it has already been engraved in my heart. One day I suddenly remembered that I realized that all these things were so unforgettable. When I just entered the second grade of high school, I had a lot of nostalgia for the teacher I had in my first year of high school. I even wanted my original teacher to continue teaching me. Thinking about it now, I felt so naive at that time.