Summer vacation is coming, and the university campus is quiet. However, a sudden murder broke this tranquility. The mysterious singing in the basement at midnight, the unknown body with its throat cut upside down, and Shang Ying, a junior boy who stayed alone in school, became witnesses to a series of strange events. The scorching sun in midsummer seems unable to reveal the gloomy truth, evil spirits? Murder? Who should bear the weight of life?