Shock! The Books I Wrote Have All Come True?

Lin Chen is a web novelist whose books have never gained any traction. Then, out of nowhere, he activates the 'Secluded Writing System.'

As long as you cut yourself off from the outside world, the System will promote your book until it becomes a hit.

The author isn't told how it does the promotion.

And so...

Lin Chen starts writing a new book: the moon turns red, meteors fall from the sky, an Immortal Emperor is reborn, magical treasures and pills reappear, and then everyone begins cultivating immortality, riding swords and crossing tribulations.

His readership grows from tens of thousands to millions, then tens of billions!

... [System: This is now the most popular book in human history!]

How the hell did it do that?

...After the book ends, Lin Chen leaves the mountain village.

He sees immortals filling the sky, lined up to pay homage to him.

He is stunned as the truth dawns on him!

So everything I wrote really came true?