Lu Buci is an apprentice undertaker. At his first funeral for an immortal, he discovers two strange things.
The patriarch in the coffin is still alive.
His own name is on the list of people about to die.
The promised twenty taels of wages were actually payment for his life.
Fortunately, he has eyes that can spot flaws. Immortal formations have gaps, cultivation methods have defects, and even the lofty path to immortality may have a place where a blade can strike.
So he snatches his first breath of spiritual energy, takes up a stolen sword, and walks away from the immortal mountain where no living person is allowed to descend.
Only later does he learn that when an immortal falls, they can become mountains and rivers, and that some people, in their quest for immortality, would have the whole mortal world buried with them.
Lu Buci wants to cultivate immortality, live forever, and see the spring beyond the mountain.
As for the patriarch in his way...
He knows his funerals. He can keep arranging them.