MTL - The Little Fairy Wife Dressed As a Villain - Chapter 1 Wearing books encounters unspoken rules

I was reincarnated into another world, and I’ve brought the Horadric Cube from Diablo II with me.
Being a knight is cool and all, but being a wizard is pretty neat as well.
So, which one will it be?

- Description from Novelupdates

Humanity has been gradually transported to the Abyss by a bored god to compete against other races and monsters.The problem is… humanity failed. In a last desperate push the strongest survivors chose a comrade to travel as far as possible back in time.

She gave up her wealth and power to save her husband and his company when they were on the brink of extinction.However he repaid her by bringing home his childhood sweetheart and divorcing her! He insulted her, called her names, a cheap lowly bitch and a gold-digger. Her sister in law treated her like trash, her mother in law called her a scheming fox who wanted to climb the social ladder.Fine! Divorce so it is then!Left without a single penny, she applied for a job and became a waitress. Who would know she bumped into her ex husband and his new fiancée there?!But there was another man whose business contract she accidentally discarded.That mysterious man came to her with a condition.“You made me lost a very important business contract, now you must pay,”“How much? I don't have money. I'm not for sale either,” the girl raised her chin arrogantly.“Become my fake girlfriend. I need a woman to please my grandfather,” Shentu Jing said. His charming dark eyes seemed to be tempting her, luring her into an abyss.But when she arrived in front of his grandfather, he announced her as his fiancée!“I thought you said I was your girlfriend!” Qin Zhuzhu glared daggers at him.“Sorry, now you are my wife,” the man's peach blossom eyes gazed at her lovingly.Who is this mysterious husband of hers?One day her phone rang with a notification of the latest financial news. There, she saw a man similar to her husband. Her husband is the richest Tycoon in the capital???!!!