Abandoned, bottomless sewers... In this abandoned underground world, there is no sunshine, no flowers, only the breath of death. Darkness shrouds everything, and only a faint light illuminates the road ahead. The damp walls are covered with moss and mold, emitting a pungent stench. You, Detective Chen, are trapped here, your heartbeat is accelerated, and sweat slides down your towering hair, but as a detective, you must keep moving forward, find the answer, and find out the truth behind it. Otherwise, you will be trapped in this underground city of death forever and become part of the sewer. There is only one truth, and only firm reasoning and brave actions can bring the murderer to justice. Come and solve the case!