While his mother is sick in the hospital and his father is always busy, nine-year-old Da-yi eats, sleeps, and manages to do everything well by himself. One day, he heads out on a short but lengthy trip to meet his mother with the help of his friends.
| Actor | Role |
|---|---|
 Lee Kyung-hoonDa-yi | Da-yi |
 Park Ye-chanMin-ho | Min-ho |
 Hong Jeong-minYoo-jin | Yoo-jin |
 Park Si-wanJae-kyeong | Jae-kyeong |
 Ok Ye-rinShi-ah | Shi-ah |
 Lee Sang-heeDa-yi's mother | Da-yi's mother |
 Yoon Kyung-hoDa-yi's father | Da-yi's father |
 Gong Min-jeungTeacher | Teacher |