Mr. Jung Taekwoon

He's 24, she's 16.
He's a music teacher, she's a student.

Gaeyoon is a 10th grader, a graduating student. She's very intelligent but she always fail in Music class especially the teacher who teaches music and gives her a creepy aura.

Taekwoon or Mr. Jung teaches Music. He before was a famous artist and pianist but then resigns for some reasons and becomes a teacher instead. He's a career type of person. Work is work for him. He's serious in everything and cold, but also has a soft spot which only a few people know.

One day. Gaeyoon is being chased by 2 men and she accidentally hides from a man standing nearby.
Taekwoon was passing by