Chaeya and Chanyeol are living a long-distance relationship. Their only means of communication is through letters. (Because the rapper thinks it's more romantic that way.) His birthday is fast-approaching and Chaeya's too busy pulling her hair off thinking what would be the best gift for the alien. Will she be able to make him happy on that day?

            Eunhee is a sweet cheerful girl who has a passion for music. Her teacher is the one who induced this passion for music. In spite of her working hard to achieve her dream as a famous singer/musician, falling in love can’t be helped.