Synopsis

Professor Chang unilaterally decides on a weekend hike for his lab, ignoring their potential plans and causing resentment among the members. The protagonist's daughter, Chae-rin, overhears her father talking about the professor and, upon realizing his rude behavior, takes matters into her own hands. Chae-rin, seemingly using some sort of power, plants a 'sin' into the professor so he will face the consequences of his actions, all while planning to frame it as a surprise for her father.