[High-Martial Arts Madness] + [Mischievous System] + [Social Menace] + [Trope Subversion] + [Maximum Shenanigans]
Beastly creatures run rampant, and martial arts reign supreme.
Lin Tian has just transmigrated into a good-for-nothing facing expulsion when he activates the "Mischievous System" by cursing out an old Taoist.
Complete the System's mischievous tasks, and he'll receive rewards.
From that moment on, things take a ridiculous turn.
At the school's rally to prepare for the beast invasion, the principal is delivering a pre-battle speech onstage.
To complete his task, Lin Tian rushes onto the platform, yanks off the principal's wig, plops it onto the head of a stray dog passing by, grabs the microphone, and shouts, "Buying old phones, long hair, and broken air conditioners!"
The principal is rushed to the emergency room on the spot.
In the martial arts exam's combat trial, everyone else is risking their lives against the beasts. Lin Tian hides behind the school bully, waits until the bully has beaten a beast down to its last breath, then jumps out and steals the kill with a club to the head. He even snatches the bully's belt and uses it to bundle up and drag away the beast, leaving the prodigy bully standing in the cold wind, holding up his pants and questioning his life choices.
When the beast crisis erupts across the land, Lin Tian sneaks into the lair of a ninth-rank beast king amid the chaos, plucks the Dragon-Transforming Herb it has guarded for a hundred years, and feeds it to a dog. Then he plants a scallion in the hole and thoughtfully leaves a note: "Eat more scallions and garlic to ward off colds."
After Lin Tian leads humanity in bringing the age of beasts to an end, he uncovers the beasts' secret and sets off to investigate it elsewhere. All of humanity eagerly sees him off, saying, "That menace is finally going to go menace someone else!"
