Lee Jaehyun and Lee Juyeon have been friends for 10 years. It's just been them, Jaehyun and Juyeon, Juyeon and Jaehyun. But one day, three foreign kids transfer to Crecker Academy and the duo are assigned to be their friends. Will the duo live happily ever after by the selves or will something change with the addition of the foreign boys? "Let's kill 'em."