The most difficult day of the year for Jung-hee, a 16-year-old girl, is her grandmother's memorial day.
Jung-hee is usually having a hard time with her mother who lives with alcohol,
but on this day, her shouting grandfather’s sister come.
She scolds Jung-hee's mother and uncle every year, asking why she does the memorial service for her grandmother who committed suicide without thinking about finding her runaway grandfather.
Since his grandfather disappeared on the day of Jung-hee's birth, Jung-hee somehow feels like it's her fault.
So Jung-hee decides to go on an adventure where she can solve all the secrets and end her mother's adolescence.