Two months ago, a strange illness erupted at Seongnam University's Institute of History, in which many researchers claimed to have heard a whisper that not only grew louder over time, but also induced hallucinations and eventually madness. Due to the highly transmissible and incurable nature of the disease, the Bureau of Investigation succeeded in sealing off the source of the disease at great cost and began further testing and exploration work. On this day, B-level investigator Lin Xiaosheng and his junior Liancheng are about to carry out an ordinary data recovery work, but something seems to be wrong. Trailer: