Su Changqing transmigrates into the body of the destined villain, the Holy Son of the Dao One Holy Sect, within the trashy novel 'Nine Profound Heavens.' Armed with foreknowledge of the plot and a unique 'Diary Fabrication System,' he decides to rewrite his fate not through brute force, but through elaborate deception. His system allows him to write fake diary entries that are mysteriously delivered to key female characters, including the icy Holy Maiden and the fierce Demoness.

Su Changqing begins fabricating an epic, cosmic backstory for himself, claiming to be a reborn supreme expert who once fought alongside legends like 'Huang the Ruthless' against terrifying Dark Immortal Emperors. As the heroines read these fabricated tales of a shattered future and endless darkness, their perceptions of the world—and Su Changqing himself—begin to crumble. Mistaking his lies for profound truths, they become obsessed with his supposed depth and power, inadvertently altering the original storyline and falling under his influence before he even lifts a finger.