Turns Out I Really Am The Protagonist

The world is filled with myriad sects, horrific demons, and rising heroes, but each only reigns for a few hundred years. This world had no protagonist; it was merely a cycle of one power replacing another. That is, until Li Si Sui transmigrated here. Suddenly, this world inexplicably gained a protagonist, and even more bizarrely, he knows he's the protagonist!

The sole heir of the Heavenly Gate Sect's leader is getting married? Let's try crashing the wedding!

An ancient demon master has perfected a divine elixir? Let's try stealing it!

He picks up treasures just by tripping, finds fortuitous encounters after falling off cliffs, and never fails at cultivation!

Anything considered useless becomes a treasure in his hands. It's no wonder the protagonist's halo is so utterly unscrupulous!

...

A world of cultivation, where the strong preyed on the weak and countless sects vied for dominance, is thrown into chaos by an unknown young man who used to be a corporate slave. Yet, renowned powerhouses dare not voice their anger, wondering who this person could possibly be.

This book is also known as "The Man Who Can't Die No Matter How He Seeks Death," "The Correct Way to Use a Protagonist's Halo," and "The Boring Journey of a Lucky Emperor Cultivating Immortality."