An Na Suh shares a house with her attractive sibling, Aaron Suh, who is well-liked by both genders. Sadly, their mother is off volunteering in Africa, and their father has been missing since Aaron's arrival. One day, An Na sets out to find her dad and just as she does, she receives word from the police that they have found something connected to him. She rushes over to discover a young boy who looks like a teenager but acts much younger. Hopeful that the boy may provide a clue to her father's whereabouts, An Na brings him home. However, the boy's origin is a mystery, and there is the added puzzle of their relation. It is possible that An Na and Aaron may not be siblings since there is no DNA evidence to back up their father's legitimacy. An Na recalls her father's dreams of going to the moon and wonders what could have happened to him. There are so many questions, including who this boy is and his connection to her dad or possibly the moon. With each inquiry, the mystery deepens, taking An Na all the way to the stars.
