The Death Knell

Novel Summary
Through United States, he was originally just an ordinary person and became a world-famous mercenary and killer.
Things are wrong, should he become a hero of justice? Or continue his dark career?
“Don’t judge me by the superficial concept of good and evil, I only do what I want to do.”
The protagonist suddenly appeared behind the author of the book about Hu Bian’s work and exploded his dog’s head with a shot:
“It’s that simple, I’m the Death Knell!
– Description from MTL