Insidious, Ruthless, Not Holy, Self-Centered, Preying on the Weak

I want to read a book similar to "Mortals Cultivate Immortality, Ten Thousand Corpses Cast Immortal Bones (Blood Demon Extremely Yin)". The plot abandons the traditional "system cheats" and emphasizes the jungle law of the jungle. The protagonist relies on insidious calculations and ruthless methods to make a living in the world of immortality, and combines the characteristics of the "old six"