My Master is a Bug

Novel Summary
As a top cultivator in the Canglang Realm, Fang Mu has been a little troubled recently.
Because his new apprentice seems to be a little brainless.
…
Brain-disabled apprentice: “Master, the GM you killed is dead!”
Fang Mu: “Nonsense, people are killed and still not dead?”
Brain-disabled apprentice: “No, I mean, he died in the real world!”
Fang Mu: “Isn’t this the reality?”
The brain-dead apprentice “Of course not, you are just an NPC in the game!!!”
Fang Mu: “…”
…
Brain-disabled apprentice: “By the way, master, the last time it was a closed beta test, how come you haven’t been recalled?”
Fang Mu: “Oh, there was indeed a time travel back in the first two months.
But here I was blocked. ”
Brain-disabled apprentice: “Master, you are a bug…”
“Um?”
“Master, you will be corrected by GM with code!”
– Description from readMTL