MTL - My Mr.Mermaid - Chapter 54 Start reading

I became a scientist for an evil organization.…But I’m too competent.

[CAUTION][+18 MATURE NOVEL][STRONG SEXUAL CONTENT]Leonardo is bullied by everyone in his class, boys and girls alike.Everyone knows he’s obsessed with MILFs, and they torment him for it.No one lifts a finger to help him.One day, a message appears:[Congratulations, Leonardo, you’ve been selected to participate in a System.]What?[You have 1 minute to make a decision regarding the NTR Demon System.][Your participation depends on your approval.][If you accept, you will gain special abilities to subdue your enemies and humiliate them publicly.][Your life will never be the same.]Leonardo accepts and embarks on a revenge journey fueled by NTR.Now that he has the System, none of those who made him suffer will be left untouched.

It begins on the mountain.

With the glint of a knife, a flash of steel in the hands of a sworn brother. A betrayal.

Stabbed and pushed down the mountain, Zi Chen lied within the red-stained snow, left to die.

This is where it begins; he is given life by lightning,
baptized by thunder.

Those who had once betrayed him should all suffer in his cruel revenge.

- Description from Novelupdates

Humanity was living peacefully on Earth for millions and millions of years until the day unknown monsters from beyond space invaded them.

When humans were about to disappear, some people with abilities came out to the light and shared their knowledge and powers with the world, and together, they managed to push back the invaders during a terrible war that had lasted for years.

This war had created many orphans, and among them, Kye had lost everything, even his parents. And the only thing he received from their death was a pale-looking necklace.

However, once the necklace finally activated, a system was given to him, and his life changed completely.

The system gave him quests to do, and Kye complied. He was getting stronger every time he achieved them, until the day it gave him a weird quest.

[You have one day to kill the one who had sinned. If you do not kill, you will die.]