The 8-year-old Yuanye Zhan (played by Xiaolin Hairen) met Cocoon (played by Xiongtian Shengya), the daughter of a farming doctor (played by Nakamura Hiroshi) in the hospital. They formed an inseparable bond at their first meeting. Zheng was diagnosed with heart disease and could not live past the age of 20. This bad news sowed seeds in the hearts of the two children, and they made an appointment with each other...