After a Hundred Years in Seclusion, I Became a Hidden Master

(Invincible protagonist + mastermind behind the scenes + infinite worlds, one or two heroines)

At the end of the Primordial Era, the immortals faded into twilight.

All paths sank into ruin, and yin and yang fell into eternal darkness.

A youth came from the Primordial Era and set foot in a new age.

In this world, martial arts flourish and prodigies abound. Some rule the ages alone, some establish their own legacies, some stand at the end of time, and some have already crossed to the other side of the starry sky. How is an immortal as ridiculously weak as him supposed to survive?

Little does anyone know: A casual melody from him creates a future empress. He plays a game of chess with an old man, and the old man becomes the strongest of all! He splashes ink across the page and creates a landscape of mountains and seas. The sword he once used becomes the ancestor of all weapons, the stubborn stone he sat on gains a spirit, and the willow tree he leaned against becomes a demon... Faced with all these unbelievable events, Murong Feng is at a loss.

Really! None of this was intentional!

I really am just an immortal who's ridiculously weak, that's all!

(I've already completed two novels of over a million words. They may not be masterpieces, but they're proof of my ability. Everyone is welcome to check them out.)