Kwon Bang-hyeon

Na Bi is a former member of an idol girl group and now an actress, but her acting is poor. Meanwhile, Hong is a movie director who studied in Poland. He is recognized as a rising star in the movie industry. He became famous for sex scenes in his films.

ソウルを流れる大河の漢江に、謎の怪物“グエムル”が現れ、次々と人を襲う。河川敷で売店を営むパク家の長男カンドゥの中学生の娘、ヒョンソも怪物にさらわれてしまう。カンドゥは妹ナムジュらとともに病院に隔離されていたが、携帯電話に娘からの連絡が入ったことから一家で脱出を試みるが……。