One day, You were suprise when you saw a familiar face in your class. Surprisingly, it was the new professor. It was Park Sunghoon, your ex. He was your first love in high school, he was a senior and greatest love. But Sunghoon left the country for college.

He went at the middle of the class, introducing himself, making you frown seeing that he doesn't recognize you.

"Good morning, class. I'm your new professor in Math. Park Sunghoon."