The blonde high school student Qie Xiaojin (played by Zhang Tinghu) accidentally saved two classmates, Xu Lihan (played by Hong Yanxiang), nicknamed the Little Princess, and Lu Qun (played by Lin Hexuan), who had a gloomy personality, on the first day of his "fifth year" of high school life. He was targeted by the school's big gangster Bat. At this time, he was forced by his grandparents to return to the family hot spring hotel that he had never wanted to approach again. In order to avoid bullying, Lu Qun and the little princess followed Xiaojin back home. Unexpectedly, the hotel was completely different from the beautiful website. It was shabby and the atmosphere was weird. They even suspected that this broken hotel was "not clean"! Xiaojin was afraid, but he was more afraid that if his grandparents got into trouble, he would have to take over the responsibility of running the hotel. "I absolutely don't want to inherit the hotel!" The idea forced Xiaojin and two unreliable classmates to form a strange community of destiny in a short period of time, and they were forced to track down clues step by step to solve the mystery...