After Bugging the Abyss, I Became the Last Line of Defense.

In the apocalyptic fortress "Tiangang City" surrounded by the abyss, Yan Ning only awakened the low-level hearing ability. He wanted to start a new life quietly as cannon fodder, but during an abnormal genetic evolution experiment, he accidentally overheard the terrifying conspiracy hidden by the city owner. Her hearing evolved strangely after the experiment, and she was able to pick up hidden movements that even the surveillance system ignored. In order to survive and uncover the truth, Yan Ning was forced to cooperate with Qi Ye, a high-ranking officer whose identity was a mystery and who also noticed abnormalities. In the underground abyss filled with bloody "watering" and desperate distress signals, Yan Ning gradually discovered that his hearing was not only a tool to discover secrets, but also the key to awakening the "root" or destroying it. On the penultimate day, the "safety period" for the mechanical fish data forgery is about to end, and the real abyss tide is approaching simultaneously with the internal harvesting ceremony. Yan Ning must use the sound that penetrates everything to steal a glimmer of life for the remaining humanity in this silent man-eating fortress before he is completely reduced to "nutrition".