Jian Tong, a 26-year-old female doctor, accidentally came into contact with An Ran, an 18-year-old boy with leukemia. She accidentally touched the boy's heartstrings, but left after disturbing a pool of spring water.
Age is a gap that can never be bridged between them. Jian Tong only wants to see each other across the river, while An Ran wants to cross mountains and rivers to see each other.