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.
| Actor | Role |
|---|---|
 Cheng Yi-hsuanKai Kai | Kai Kai |
 Wu Hung-hsiuLong | Long |
 Huang Jie-feiJin Zhi | Jin Zhi |