Fantasy: Unreliable Master and Disciple

The dead man Luo Zhan traveled to a different world in a traditional way! Become a master after traveling through time? Possession flow? Do you have a grandfather inside you? Ring grandpa flow? My body turns out to be this old man's? WTF? The old man who has lived for nearly a thousand years thought he was an expert, but it took him eight hundred years to build a foundation? The system looks like this and has the nerve to tell me that two wishes can be fulfilled at once? Can you be more reliable? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.