Mysterious Doppelganger Awakens! Mastering the Secrets of the Mind Field to Prove the Dao

Mystery of the Sequence: Light and Darkness, Blood and Song, Destruction and Rebirth

Dark, Cold-Blooded, No Female Lead, No Teammates, Decisive and Ruthless, No Do-Gooder

Are there any novels similar to Endless Killing Intent?

Anything From Your Browsing History Is Fine. Female-audience Novels Are Fine Too, Since I’m Not the One Reading Them Anyway

Dark, Cold-Blooded, and Ruthless, Stopping at Nothing for the Dao

A Story About Developing Metaphysics and Technology, Starting With Trading Technology for Metaphysics

Just to be clear, it starts with technology, then the protagonist gets something that allows them to trade. After trading, they level up into some kind of agent, then get matched with people from a cultivation world to trade with, and gain things that unlock skills and so on. Ideally, something similar to "Transcendent Time-Space Trading".

Looking for High-Quality Books

I'm looking for books similar to "The System Grants Me Eternal Life, and I'll Eventually Become Invincible". Are there any without the same old tired tropes, like the protagonist going somewhere, getting mocked, and then turning the tables, and with no female lead?

Looking for Dark Fiction with Smart Characters, Self-Interest First, and No Harem~(￣▽￣~)~

Looking for Classic Dark Fiction

The protagonist is ruthless and acts without restraint, killing decisively.