Chen Er: A Dog's Road to Immortality

Chen Er and a big black dog transmigrate to another world, a cultivation realm, with a longevity System.

They have grand ambitions, but the System is useless, and neither of them has a spiritual root, so they can't cultivate.

Eventually they discover that eating spiritual treasures is the only way to increase their cultivation. Thus begins their path to immortality through endless eating.

They take things one step at a time and keep a low profile all the way. The events unfolding in the cultivation world seem to have nothing to do with them, but in reality, they're all caused by the two of them, entirely by accident.