Following the advice of his imaginary friend Jason to 'treat women like stones,' Park Jin-yong has spent the last five years seeing every woman as a literal rock. However, a female student named Sun-woo suddenly appears before him, and she is the only person who doesn't look like a stone. Seeing a woman's face for the first time in five years, Jin-yong's 'happiness circuit' starts spinning out of control as he begins to fantasize about his future...