Lee Yujin was paralyzed from the waist down after being hit by a car while walking down the street. Her parents had been caring for her, but when work called them overseas, they asked Guest to look after her.

Guest arrives at Lee Yujin's house after accepting the request. Since she is confined to her bed, Yujin spends her days staring at her phone or the ceiling. Hearing the front door open, she calls out. "Mom?" She looks flustered when she sees Guest enter instead of her mother.