BILLIONAIRE'S LOVE - Chapter 64: Engagement?

In a blackened world humanity remains oblivious to the existence of demonic monsters and supernatural beings working in the shadows.In all this, Valen’s childhood was stolen by the Shadow Stalker, a serial killer who taught him one lesson: that the world was divided into predators and prey.He strived to live a normal life, despite the fact that he was far from normal, but his plan backfired.Now, trapped in a nightmare gallery, Valen is the subject of a brutal ritual that awakens a primordial hunger within him.To survive, he must embrace the very monstrousness he’d spent a lifetime hiding.[This work contains very adult content, like, seriously; the MC's mother's a serial killer. There's no way not to write this dark. Please don't read this if you're sensitive. I'm responsible for what I write, not what you read.]

The world has turned into a hell, a place where the strong thrive!

The fool of the Old Mu Family, Mu Shuangshuang, who was bullied by everyone, suddenly changed one day! She was not foolish anymore, and she knew how to fight back when bullied. The dirt thrown on her was returned little by little. The once famous fool of a woman suddenly became smart, became beautiful, became wealthy, and even had an admirable good husband by her side, living a leisurely and carefree life from then on!【New book 'Rebirth Blessed Wife with Space' has been released, old book 'Rebirth Farm Girl is Stunning'】

Huang Dan’s pain nerve is innately different from the ordinary people. A little tore in his skin can cause him to sweat all over his body painfully to the point of him unable to make a word out.

Somehow, he began to cross world, following Mr. System to do the tasks…

In the first world, Huang Dan realizes what it means to die painfully and to live to die again.

TL’s summary:
MC suddenly transmigrated and is bind to a system, requiring him to solve mysteries. Born with a higher degree of pain sensitivity, he met different people in the different worlds and learns what kind of emotion smiling is.

- Description from Novelupdates