MTL - Rival In Business - ~ Work related

I am not that good with synopsis, So please read the first chapter instead.

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After accidentally killing the male lead and changing the course of the story, our Demon Queen finds herself in a very complex situation.

As the final villainess of this world, her mission was to be defeated while making the Chosen Ones stronger.

But fate played a cruel trick on her.

Left with no other choice, she finds herself forced to serve the Female lead to survive.

As the story unfolds, our Demon Queen must navigate her new life as the heroine's servant while also trying to uncover the truth behind her sudden change in fate.

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Fate had never been kind to Ji Ning. Wracked by illnesses and infirm his entire life on Earth, Ji Ning knew early on that he would die as a teenager. What he didn’t know was that there really was such a thing as life after death and that the multiverse was a far larger place than he thought.

The King of Hell sentences you to death by midnight, but I can ensure that you live past morning.

The young man, Qin Lang, received the inheritance of a poison school by chance. He uses poison to kill people, uses poison to save people and he uses poison to chase beauties. With body of ancient extinct poison and a body of a martial artist, he walks around the city, and wanders around in the underworld.

- Description from Novelupdates

Otaku Tang Yi traversal obtains a systematic counterattack.

waste? You can still find your teeth everywhere.

Easily relax the artifact, simply become a master.

Daguai upgrade, killing also upgrade.

Crush the heavens and the world to achieve the invincible supremacy.

genius? In Tang Yi’s eyes, it was just a joke, not as good as a pet dog in the system.

- Description from Uukanshu