In 2031, the "Echo Disaster" breaks out around the world - if strong human emotions such as anger, despair, and sadness are not digested in time, they will condense into "noise beasts" and swallow up all surrounding sounds. The world has fallen into deathly silence and panic. Countries have established "silence bureaus" and used silenced weapons and emotional suppressants to survive.
Jiang Du, 28 years old, was once a talented MC in the underground battle field. After a mistake in a game caused his opponent to have an emotional breakdown and be devoured by a noise beast, he was banned from working as a delivery boy at McDonald's. While delivering food, he was accidentally involved in a noisy beast attack. When he was about to die, a metronome sounded in his head - he awakened the only "rhyming magic" in mankind: as long as he uses rhyming lyrics to obtain the "resonance value" of at least one listener, he can turn the sound into a weapon.
The price is: every fight must face the "underground octagonal cage" in the mind-a virtual audience scoring in real time. If the resonance value falls below 15%, he will be assimilated into a new noise beast by the audience's ridicule.
Jiang Du was recruited by the Silent Bureau, only to discover that the top management was secretly building an "emotional harvester" in an attempt to use noise beasts to exterminate the bottom population. He must form his own rap label and declare war on power rhymes with a microphone. And the ultimate truth is: the source of all disasters is actually a deciphered rap that comes from the future and attempts to rewrite history...
