Soyoung, a woman in 20s struggling between making a living and getting a real job, begins tutoring a high school senior Minjeong. One day, Minjeong asks Soyoung if they could reschedule a session.

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.