Oops, I became the witch's substitute

After crossing over, Feilin didn't have a very good life, but fortunately he had magic that was good at deceiving people.
In order not to be bullied, Feilin decided to find a great witch as a backer.
Feilin used magic to create a substitute for the great witch.
The good news is that he successfully made the world believe in the existence of the great witch, and the substitute disguise was a great success.
The bad news is that people began to think that "Feilin" was the substitute of the great witch.