MTL - Problematic Sister Fell In Love With Me - Chapter 2 My problem sister

(Third Person Limited PoV.)Betrayed by his fiancée, mocked by his siblings, and disowned by his family—that was Lev’s fate.Even when he regained memories of his life on Earth, where he realized that his world was strikingly similar to his favorite novel, it still didn’t help him change anything.How could it be?Because the protagonist of the story had already achieved his happy ending—gaining a beautiful wife and living a blissful life. Meanwhile, the world continued to move forward.What do people usually do with a novel that has ended? They tend to stop caring about the world within it, even if it falls into ruin, especially if the novel isn’t particularly popular.The world Lev Razanov lived in shared a similar fate—it was destroyed.[Hero’s System successfully installed.][Critical condition detected.][Do you wish to return to the past?]Lev was given a chance to return to a time when the story of his favorite novel had just begun.Although he was destined to become an extra villain—a pawn of the pawns serving the real villain, he vowed to end the lives of anyone who had caused him suffering: his siblings, his fiancée, the main character, or anyone else.[Hero’s System inherits your desire from your life on Earth—the desire to do good.]“Who said killing your enemies is an evil act?”

He emerged from Hell Tower, one of Earth's most mysterious four forbidden zones, known as the Infernal Black Emperor who strikes terror into the hearts of his enemies!He is also the master of the Yin Yang Divine Needles, instilling fear into the Western world as the Eastern Divine Physician, with the ability to save lives with his left hand and take them with his right!Upon returning to the city, he marries the beautiful CEO of the Eastern Group, only to face his father-in-law's regret at the doorstep.'I excel at two things, saving lives and taking them; the ones I choose to save, not even the King of Hell dares to claim, and those I choose to kill, not even the Heavens can save!' —— Ye Xuan

The end of the world is coming, the world has undergone great changes, and everything has changed. Plants, animals, and even insects, as long as there are living things, have mutated.
Become more powerful, and even evolved supernatural abilities, such as chickens and ducks that can fly to the sky, such as cats and dogs that can breathe fire.
But only humans, without any obvious changes, seem to have fallen from the top of the food chain to the bottom of the food chain overnight.
Any creature that can open its mouth to eat can treat humans as food.
But fortunately, this world has not completely killed humans. Gradually, humans discovered that they had the ability to cultivate compatibility with other creatures.
As long as it has a high degree of compatibility with some powerful mutant creatures, it can be used for its own use to achieve the purpose of protecting itself.
Fang He is a person who is very compatible with mutant animals, but it is also because of his ability that he has changed from the strongest to the stupidest.
Fang He, who was reborn, said, “Hmph, this time…”

- Description from novelbuddy

I thought I would live a better life in my second lifetime. Unbelievably, I’ve reincarnated into a slime that rolls around on the ground. Anyway, this is my precious new life, so I must work hard.