Growth is learning to live with trouble. Kai, a ten-year-old boy with irritable bowel syndrome, plans to send the love letter to his crush, Jenny on Moon Festival.

A-Jun, who lives by himself, is gradually slipping away from normal growth development. During this period of his life, there’s many perplexities around his world. Isn’t it just one way off going down the stream to Jia Jiu Liao and set him free?