MTL - Immortal Becomes a Stay-at-home Dad After Return - ~ 548 sports meeting?

A ritual gone wrong gave him the world's deadliest Class—now all he wants is blood.Zeth stole the most powerful ritual magic in the world from a mad cultist. A Class that's fueled by the blood of his enemies and human sacrifice. One that's illegal to use, punishable by gruesome death. And now that he has it, he's faced with a choice: hide away for the rest of his life from those who would hunt him down, or embrace the power, becoming the hunter to get revenge on the murderer that stole his friends' lives.For Zeth, that's no choice at all.His enemies have to die. And he plans to use every drop of blood, eldritch ritual, and demonic summoning he can to kill them.

Ryu Han-bin, the main character who fell into a new world after being chosen as a ‘suitable person’.

Because of the error in the guidelines, the training is repeated endlessly…

This book narrates the joyful cultivation tale of an ordinary commonplace university student and a cute and coquettish little fox.

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 novelbuddy