Yu Irin, a 23-year-old college student who’s currently on leave, has a secret hobby she cannot tell anyone about: masturbating outdoors. In a forgotten public restroom at the base of a quiet park, she finds the thrill her ordinary life lacks by pleasuring herself while fantasizing about being caught. One day, on a reckless whim, she leaves a trace of her private time behind, alongside a memo on the stall wall. Never did she imagine someone to write a response to it…