On the third anniversary of his father's passing, a woman who was once his father's student suddenly appears at the doorstep of her carefree son. She comes seeking memories of her late mentor, a university lecturer. Honoring her wish to pay respects, they share stories about the father's past, revealing a side of him the son never knew. Moved by the debt of gratitude she owes to the father, she expresses her desire to repay that kindness to his son—and the story begins right there.