Zhang Meng, a college student who was tortured by the noise upstairs and was on the verge of collapse, accidentally bought a mysterious silent earplug that claimed to "solve the root cause of the noise." After putting on the earplugs, she finally got a peaceful sleep that she had not seen for a long time. However, three days later, she learned that the family upstairs had been murdered for many days. The time surprisingly coincided with the time when she briefly woke up after wearing the earplugs.
