His Majesty's Devious Sins - Chapter 20: Never Let Go.

For the sake of his family, Ren embarked on the popular VRMMORPG, COVENANT, that used real-time in-game currency. But being a mediocre player who only knows how to gather information, he was put in a supporting role.

As the game explodes in popularity and every multibillion-dollar company invested in the game, things have turned for the worse for Ren. Due to the amount of information he gathered, the cheats, secrets, quests, and bugs he discovered, he was silent in fear of selling the information to the other guilds.

But given a second chance, he went back in time when his father was still alive and COVENANT was just in its starting phase.

This time . . . he wouldn’t be that guy on the side who gathered information from day in and day out for ten years.

Equipped with the games knowledge he accumulated, he will become . . . an Alchemist!

Chrono Mage? Djin Master? Summoner? Necromancer?
Chaos Lord?

What good are those?

Sure they’re powerful and rare classes and sought after by guilds, but it’s the alchemist who forged artifacts and concocts rare items and potions that gets the most coins at the end of the day!

It was better than being a blacksmith or a crafter! Plus, he could use all sorts of magic without limit to race and class!

It was the ultimate class! And no one even knows it!

A young man with an extraordinary mind is off on an exciting adventure when he mysteriously wakes up in the body of a feeble slave-guy in a different, rich in quirks world.

The main character, a selfish jerk, would use extreme means to achieve his goals. However, he never allows his base instincts to overrule his sense of decency. He always pays back both good and bad deeds.

Will his (terrible/excellent) mentality help him make a fresh start? Will he get through misfortunes and hardships of the new world?

This appears to be this type of story:

Soon after knowing that she was going to marry Song Shi An, Su Tang made a firm resolution to barter to get a bill of divorce within one month!

The reasons are many with one being crucial, that pan of cold noodles has been an eyesore for a very long time!

Actually, it is this type of story:

Has lightning, dog blood, even more it has big meat. Love steamed buns, love beautiful meals, as well as love household tussles.

Go out to build the family fortune, enter the house to steadily accompany the lady of the house! Who dares to interfere? Stiff penalties being served!

- Description from Novelupdates

Yuan Xiao was reborn. Only after her death did she discover that she was living in a book. In the book, she was a fake heiress who did terrible things and made the real female protagonist look like a good person. After being reborn, Yuan Xiao decided to become a scholar. As long as she studied hard enough, she’d repeatedly get the opportunity to draw prizes and stop herself from being controlled by the storyline. She wanted to change her life. Yuan Xiao did not want the terrible fate of her past life to repeat itself.

She wanted a life that belonged to her! Other students looked down on her. She made sure to win as many prizes in competitions as she could and consistently claimed the number one spot in school. Some people suspected she might have forged her educational accomplishments due to her young age. She directly solved the toughest questions in the world to prove those people wrong. Did somebody mock her for not being able to do anything else but study? She’d show them her world-class piano-playing…

Yuan Xiao went down the scholarly path and never looked back. She was no longer the bad student she used to be. The smart student in school, who nobody dared to offend, forced her into a corner and nervously gave her a lollipop. “I just gave you a lollipop, the thing that I like the most. When will you be my girlfriend?” Yuan Xiao tapped on his chin and chuckled. “I’ll be your girlfriend if you get into Q College with me.”