A boy named Sami, who is about to finish high school in Canada, saves a girl from drowning. He is celebrated by his three friends for doing so. After school, if it were up to his father, he would go to university and study law. But Sami wants to take a different path and go into business. His father is against it and Sami promises to do only an internship before starting university. Through his grandfather, Sami gets an internship at a mysterious hotel. It has a dark secret and guests disappear, only to reappear confused. Sami notices that it is due to a door that leads to the basement, and wants to solve the mystery, but in doing so, he himself falls into the clutches of the mystery.