The down-and-out little girl Su Yiran meets a strange little boy Jian Fan, who claims to be an alien and becomes friends with Su Yiran. They made an appointment to meet every morning. One day, the girl had to leave this place because of her parents and had no time to say goodbye to the boy. The boy ran to the agreed place and waited patiently at the appointed place, but did not see the girl.
When she grew up, Su Yiran, whose parents died, changed her name to Su Mo and met Jian Fan again. However, the two did not recognize each other and became sworn enemies. After going through many experiences, Su Mo discovered the insurmountable secret that lay between the two.
One is a girl whose parents died in a car accident and was severely injured, and the other is a boy who suffers from respiratory failure and even breathing is a luxury.
There has always been the closest and farthest distance between us.
An incomplete past, an unattainable future...