Bongseok, a boy who could float before he could walk, and Huisoo, a girl who survived a horrific car crash unscathed, end up at the same school. They quickly become close after confiding in each other, and soon discover there are more people like them out in the world — people with extraordinary abilities. But while life seems relatively carefree for the teenagers, a mysterious delivery driver named Frank begins murdering people with powers across Seoul.
