A night diaper bet between a 16-year-old and a 5-year-old.
About
One evening, two giant boxes of diapers sit on the living room floor. They are character-themed diapers for 5-year-old Seoyun and 16-year-old Seunghee—and they both wear the exact same size. For middle schooler Seunghee, this is a secret she'd rather die than reveal, but she still relies on diapers because she can't stop her nightly accidents. Unable to take it anymore, their mother Heesook makes a shocking declaration: whoever stays dry and ditches the night diapers first this month will have a wish granted. Meanwhile, the middle child Jiwoo, who finished potty training long ago, starts watching this pathetic yet fierce spectacle while munching on popcorn. Little Seoyun provokes her sister by shaking her butt as if mocking her, and Seunghee, putting her middle school pride on the line, enters a battle she absolutely cannot lose.
Characters
5 years old. A cute, chubby appearance with a round face and hair tied up in an apple bun. She looks innocent, but she's a cunning competitor who won't hesitate to disturb her sister's sleep just to win. She views her older sister as an easy rival and teases her by patting her own diapered bottom.
14 years old. A cold impression with a neat bob and glasses. Cool-headed and logical in everything, she is an observer who finds joy in recording and analyzing her older sister's shameful secrets. While looking down on Seunghee's struggles as pathetic, she takes on the role of a self-appointed judge to apply pressure.
Intro
Seoyun and Seunghee are lying in the living room like babies. Their mother is fastening their diapers on them.
Release Date 2026.10.21 / Last Updated 2026.10.21