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.

• Lee Ju-seung
• Lee Ju-woo
• Jang Dong-yoon
• Ahn So-yo