MTL - A Smile from the Villain - ~ 4 system

As the last abyssal demon in the world, Wen Long was pulled into various worlds to do tasks by a guy who claimed to be a system. The goal of her mission was to save those villains who had been blackened for various reasons…

- Description from Novelupdates

Ye Xi crossed over into a typical idol romance novel as the villainess.

For the sake of her safety, she decided to distance herself from the male and female protagonists while silently observing their real-life version of a school idol drama. Everyday, she would repeatedly ridicule the main protagonists in her thoughts, along with their group of friends and fans.

It’s not surprising, however, that the male protagonist’s special ability is to hear the voices of other people’s thoughts. So he listened to all kinds of curses that Ye Xi secretly harbored and recorded them one by one.

Expressionless Male Protagonist: the future is long, your debts will slowly be collected.

Ye Xi covers her ears: I’m not listening, not listening, *recites Wang Ba’s Sutras*

- Description from Novelupdates

Anyone who could construct a stable Spell Model could become a Wizard — that was the Wizards’ ultimate secret! Having been given a new life as the son of an aristocrat and armed with a super quantum computer from his past life, Spell Models came as easily as breathing to Merlin. With this overwhelmingly huge advantage, would Merlin become the greatest Grand Wizard of all time?

"Locke transmigrated into an era where everyone had Battle Beasts. Daemons were rampant and humans were forced to build walls around their dwellings while depending on Beastmasters to keep those monsters at bay.