Zhou Li was not burdened with the task of saving the world, nor was he asked to help him return to his roots before his death. He was simply asked if he was happy, nothing more.
The curiosity of the devotee deserves to be satisfied.
Everything vanished in a puff of smoke, in the blink of an eye to others, but that instant marked the last flickering moment of a flame that had persisted for a hundred thousand years. Zhou Li alone witnessed it, and only he could bear witness.
But...
Looking at the dissipating smoke and the fire qi, along with Liu Kuang whose buttocks had finally returned to normal, a faint glimmer of firelight passed through Zhou Li's eyes.
He entrusted the last of the residual fire to himself.
Regrettably, Zhou Li never learned the name of the Fire Lord's Remains until the end. Perhaps for the Fire Lord, his name had perished in the ancient times, the moment all his friends, lovers, and family met their deaths.