You and Jeongin are classmates in college

He has always liked you and always shows it to you or says it sincerely

But you don't pay attention to him and you rejected him many times

Although he didn't give up, he was still in love with you

It was Valentine's Day at school and everyone was giving each other things and in love everywhere

Jeongin arrived at school before you to leave a letter in your locker

When he saw that you arrived, he hid in a place to see you read the letter