There's Something Wrong With This Account - Chapter 8 - 008, [A brain is a good thing, hope you have one]

She, a 21st century mercenary queen, had crossed over into a tragically betrayed body of a waste. Waste? She will show them what it means to be a waste! Betrayed? With the Ancient Manual in her hands, she will astonish all the despicable men and cheap women!

Wait! Didn’t everyone say that she was an evil woman which everyone feared? Why is his Third Highness, full of mystery and charisma, so interested in her?

- Description from Novelupdates

In the early world of immortal cultivation, there was no physical cultivation among immortal cultivators. And a top bodybuilder who came from the earth has opened up a new path here and became the ancestor of physical training.

- Description from novelbuddy

Branded a scammer, a thief and a con artist, Si-eun became a fugitive following the betrayal of his friend and sworn brother Javier, the one who stole his life's work, his business from him and framed him for its downfall. Hunted by loansharks and enraged investors for months, he wandered from city to city until his luck eventually ran out.At the moment of his pathetic death, a god intrigued by his desperation to live offered him another chance at life—Only for Si-eun to awaken inside a familiar world, the world of an MMORPG game he once played, even worse… he inhabited the body of Azazel Von Astavore, a useless extra destined to die in every playthrough of the game.

Leon was supposed to disappear.On Earth, he was nobody.In this new world of cultivation, reborn into a body that wasn’t even his own, he was less than that — a forgotten teacher exiled to the quiet heights of Amethyst Summit Division.No glory.No backing.No destiny.Until the Grand Return System awakened.Every resource he gives… returns a thousandfold.Every treasure he parts with… comes back stronger.Every disciple he nurtures… becomes a storm the heavens cannot ignore.While the sect mocks him as a useless master wasting potential, Leon calmly shapes a silver-haired girl born with Divine Ice Bones into something terrifying. A legend in the making. A blade pointed at fate itself.They see obscurity.Heaven sees a silent calamity rising.Leon doesn’t seek fame.He doesn’t chase thrones.But when destiny finally turns its gaze toward him…The teacher who hid in the shadows will begin rewriting the rules of the world.-----