Overview
Sejun and Song-i went on a school trip and couldn't return with the sunken ship. Leftover Seolhee and Seong-cheol wander under the weight of a hard life. Also, the remaining Sejun's mom and Song-i's dad remember and endure the children they sent first. The story of them living in a time that can't be cured.
| Actor | Age then | Age now | |
|---|---|---|---|
 | 33 | 36 | |
 | 32 | 35 | |
 | 30 | 33 | |
 | 35 | 38 |