Namjoo is an ordinary junior student studying in Seoul High School. She is a silent one, she have only one friend that she considered as a sister, she is Naeun.   Unlike Namjoo, Naeun is an opposite of her. But they can still understand one another.   One day Namjoo life change when she met Mark, an exchange student and classmate of Naeun. When she first saw him, she can tell that he's the one for her. But it turn around, he likes Naeun.   At th