Ye Xianglun is a transfer student at Tanjiang Art Middle School, and his father is a music teacher at the school. When classmate Qingyi (played by Zeng Kaixuan) took Ye Xianglun to visit the school, he was attracted by the sound of the piano in the school's old piano room, and found a pretty girl, Xiaoyu. Their eyes met and their pure love story began. Later, Ye Xianglun knew that Xiao Yu was his classmate, and the reckless Xiao Yu was always late, which caught Ye Xianglun's attention. Xiao Yu and Ye Xianglun gradually approached each other to the extent that they shared secrets with each other, but whenever Ye Xianglun asked about the mysterious music when the two met for the first time, Xiao Yu always told him that this was a secret that could not be revealed
It turns out that Ye Xianglun and Xiao Yu are not from the same era, and only he can see Xiao Yu from twenty years ago. Because Xiao Yu accidentally found a sheet of music in the piano room, which said that if you can play it quickly, the first person you see at first sight is the person you like. The came twenty years later. Ye Xianglun asked Xiao Yu to meet in the piano room at night, but unexpectedly, Qingyi came first. Ye Xianglun kissed her by mistake with his eyes closed and was seen by Xiao Yu who rushed over.