Monsters of Jeju Island have been looking for opportunities to get rid of the human world for a long time and have started to target a chaebol heiress who arrived on the island. Daehan Group's Won MiHo is the only daughter of the company's chairman. Her selfish and arrogant attitude led to her father's decision to send her Jeju Island. There, she was assigned to teach ethics at a high school, where evil was roaming free without her knowing it. Together with the other individuals on the island, she starts to form a new community to survive.