As humans turn into savage monsters and the world plunges into terror, a handful of survivors fight for their lives — and to hold on to their humanity.

Jung Young Jae is a promising young surgeon, but her cheerful demeanor hides a childhood trauma. The pair are both drawn to a mystical forest in Korea's countryside.

Lee Young-O is an excellent neurosurgeon with zero sympathy. One day, he becomes involved in bizarre patient deaths. He also falls in love and recovers his humanity.

An undercover cop has his loyalties tested when the boss of the corporate gang he's spent years infiltrating dies.