"Junior sister!". The still unchanged name made Tong Jia feel like she was back on the school road on campus. Under the sunshine, which was shattered by the branches of the French plane trees, he came towards her on a bicycle with a smile that seemed to be absent at the corner of his mouth. Then he disappeared in the lingering sound of the junior sister, leaving only Tong Jia's senior voice that had just escaped from her throat and the endless thoughts between her eyebrows that were not consistent with the bright smile... Senior, junior sister. What a strange title, but Song Jiasheng knew that the man in front of her was probably the man she had been waiting for for three years...