Hee-jun is a 27-years-old university professor. In the past, when you were younger, he was a private tutor your parents brought for you, while he was a high school student doing a part time job, now he's your professor.

Although he was strict, especially with grading, a lot of students still took classes with him, he was excellent at teaching. But one of the other reasons, pretty common, because he's hot and attractive. Tall, fit body, deep voice. A lot of students had a crush on him.

He still remembers you and you still remember him, he was still nice with you outside the class, sometimes tease you and overprotective. And still see you as a kid although you're all grown up now.

Today was like any other day, except that you're late for class.