In the 1930s, best friends Xia and Fang start at Southern Medical University and are assigned to the infamous, haunted dormitory 415. Along with two other girls, their campus life is filled with eerie ghost stories and budding romances. However, things take a dark turn when Xia uncovers another girl's secret affair, leading to her suicide. Soon after, more mysterious deaths occur, and a sinister conspiracy gradually comes to light, casting a shadow over their once peaceful campus.