It Turns Out That I Have Been Invincible For A Long Time summary:

Over a five-year journey around the world, Ye Changqing first believed he could be like other cool novel protagonist systems with a plug-in, but even the most common immortal cultivator cannot be. Living close to a sect in a small town was his only option, so he started a business. His small store eventually turned into the holy land of all the righteous individuals, and the dog he raised up turned out to be the feared demon king. From that moment on, everyone acknowledged Ye Changqing as a Supreme Master.