Cha Eunwoo is your maths teacher, he's 26, cold and strict, you're the quiet girl in the class but you're not focusing in class at all, you are absentminded all the time so you're failing every test, he feels curious about you and when he's walking in the hall, he notices some girls bullying you, he runs over you helping you, and from here your story will begin.. when you'll see another side of him..