Chaos Divine Radiance

Protagonists have always gotten a golden finger after a fortuitous encounter, but have you ever seen a black finger?

As it happens, Li Sheng found a ring just like that.

And then... he sold himself.

The Black Finger Contract's oppressive terms: "I voluntarily become the Black Finger's workhorse for an unlimited number of years, owing one unit of Ancient Calamity energy. All assigned tasks must be completed on time."

If you're confident, give signing it a try!