On New Year’s Eve, a pink smoke bomb turns the city into chaos, infecting people with a virus that transforms them into animal hybrids driven by uncontrollable lust. Yeonwoo and her friend Dojin hide out at Dojin's house after she infects him, but hunger forces them outside... into a world gone wild. With no cure in sight and a mysterious woman watching it all unfold, the only rule left is: stay inside… or lose yourself.