Yu Bai and Qing Yan grew up together. Yu Bai was one year older than Qing Yan, so he took on the role of his elder brother. However, he took a break from school for a year due to health problems. Qing Yan often visited him when he was in elementary school.
Yu Bai's health has almost recovered since high school. He went to the same high school as Qing Yan. They haven't seen each other for only a year, but their relationship cannot go back.
Concept: The past can become a new beginning