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.

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?