Siw and Best, two close friends, enrolled in an extra class at a tutoring institute. There, they came across a chilling legend about Kru P’Wan, a mysterious former teacher. Intrigued, they shared the story with Best’s older sister. Soon after, Best invited their other friends—Got and Dear—to join them at the institute. As the four of them began their lessons, they started noticing strange occurrences, especially around the fourth floor, which had been sealed off. Their curiosity grew stronger as they tried to unravel the creepy legend and uncover the truth behind it. That’s when Danai, the janitor of the institute, suddenly appeared…