Six years ago, when Wooju lost her father, she came across a kind-hearted alien in the mountains. Ever since then, she's been an avid fan of aliens, but she pretends not to believe in their existence out of fear that her classmates will ostracize her. One day, Wooju discovers a school club that meets her interests. She's excited to finally share her passion for aliens with others, but she has no idea that this will be the beginning of her exciting romance with the student body president Huimun, who has a secret of his own.