Two main characters, Irene Hyun and Oh Sehun. It's Irene's final year of being a student, and she's determined to take on her career life. She crosses paths with the school's rich outcast, Sehun, who totally neglects school life. Their lives intertwine, and they go through obstacles together, understanding one another along the way. A mysterious man follows Irene everywhere, but what happens when Sehun encounters this?