In fact, Su Cheng had almost forgotten everything about being with Gu Wenxuan, because she was still too young at that time, and many memories became very blurry. Su Cheng didn't know how many years he had been neighbors with Gu Wenxuan. It seemed that they had been together as long as he could remember until he went abroad. I was still young at that time and was unfamiliar with the word separation. I only remember that I cried when Gu Wenxuan left, and I held her tightly at the airport not wanting to be separated from him. Later, Gu Wenxuan, who was still the same age as him, held his hand and said that he would come back and take him to school when school started, and would also bring back toys and delicious food, so he let go. Then that summer vacation seemed to become very long, and then when school started, because he had new playmates, it seemed that he gradually forgot about him, and then he went to elementary school, middle school, high school, until now...