In the Qi Refining Stage, I've Lived for a Billion Years

[Urban Cultivation + Immortality + Divine Physician + Invincible + Pure Power Fantasy]

Qi Refining is the initial stage of cultivation.

But Li Yu was trapped in this realm for a full billion years, refining qi until he reached one hundred million layers.

Twenty years ago, he threw caution to the wind and began his final attempt to reach Foundation Establishment.

In the end, he neither broke through to Foundation Establishment nor reached the 100,000,001st layer of Qi Refining.

Instead, he returned to the first layer of Qi Refining.

Only this time, the qi he refined wasn't spiritual energy, but...

Immortal energy!

I'm at the first layer of Qi Refining, and I've become an immortal?