In his fifth year of high school, Xiaogin switched to a third school. In the winter, his grandfather persuaded him into returning to the hotel his parents founded. Little Princess and Lu Qun followed Xiaogin uninvited to avoid bullies. While staying in Xiaogin's family hotel, the three boys discovered it was in bad repair and haunted. Xiaogin and his buddies have grown close as they seek the truth. Will they unearth the secret of the hot springs?