I'm Actually the Mastermind Behind the Scenes

The old man waiting in the silent space could destroy this world with a wave of his hand, but he stood there motionless and waited. Under the Broken Soul Cliff, a strong man carried a guzheng alone, walking step by step on the muddy road, also waiting for someone to arrive. Who I am? Where am I? What on earth am I going to do? It doesn't seem like I need to think about it. I only know one thing. If it stands in front of me, I can kill anyone. This book is an infinitely fast and nonsensical piece of writing.