Based off of a popular webtoon series of the same name, Island tells the story of a group of people who are fated to save the world by facing off against an ominous force on the island of Jeju.

Won Mi Ho is the only daughter of her father who runs Daehan Group. Her arrogant and selfish attitude causes her to make a big mistake that eventually angers her father into banishing her to Jeju island. There, she is assigned to work as a high school ethics teacher. Unbeknownst to her, the island is where evil roams free. She meets other individuals on the island and together, the characters join forces to live.