The 'Beast Cop' Ma Seok-do heads to a foreign country to extradite a suspect, but soon after his arrival, he discovers additional murder cases and hears about a vicious killer who has been committing crimes against tourists for several years.

When a devil-worshipping criminal network plunges Seoul into chaos, the police turn to Holy Night—a trio of supernatural demon hunters—to restore order and defeat the rising evil.

In 2029, an elite police squad combats an anti-reunification terrorist group while another enemy lurks nearby.

Mimi started to gamble, dreaming of turning her life around. One night, she loses her family in front of her eyes in an unknown attack from an unidentified assailant.