In his previous life, Liang Wujiu died from overwork after endless 996 shifts. In this life, he transmigrates to the cultivation world and becomes a menial tasked with cleaning the latrines of the Azure Cloud Sect.
On the day the sect holds its awakening ceremony, others awaken the laws of space, light, and flame. He touches the awakening stone, and it cracks, revealing four words: [Law of Being a Jerk].
A System appears in his mind: [The Jerk Gets Stronger System. The more of a jerk you are, the stronger you become.]
Liang Wujiu: “What the hell? Who are you?”
System: [Your dad.]
And so...
He sprinkles laxative beans into the Demon Venerable's alchemy furnace. The Demon Venerable farts in his seal for three hours, and every sect elder works through the night reinforcing the formation.
He swaps the righteous leader's life-bound flying sword for a rainbow-flashing plastic toy. The Sect Master flies into the air on his sword, which then breaks, sending him face-first to the ground from a height of three thousand zhang.
He replaces the grand finale treasure at the Myriad Treasures Pavilion auction with an identical trash bag. In front of all the bigwigs, the buyer pulls out a bag of slop.
The entire cultivation world issues a joint wanted notice: “This man is utterly shameless. He must be executed!”
Liang Wujiu sits on a hill, cracking sunflower seeds. “Don't rush. This is nothing yet.”
His childhood friend, Jiang Jian'yue, blocks the door with a broom. “Liang Wujiu, did you put salt in Senior Brother's tea again?”
Liang Wujiu: “He kicked my manure bucket first.”
Jiang Jian'yue: “How much did you put in?”
Liang Wujiu: “Half a jin.”
Jiang Jian'yue: “...Nice work. Next time, invite me along.”
System: [Host, could you have a little shame?]
Liang Wujiu: “No. Putting points into thick skin isn't worth it.”
Starting with cleaning latrines on the Jiuzhou Continent, he keeps being a jerk all the way through the small, middle, and great thousand worlds. In the end, he ascends to the Divine Realm and becomes the master of the Jerk Dao across myriad worlds: the Lord of Ten Thousand Flaws.
The old man of the Heavenly Dao personally offers him a cigarette.