Potaatoo

Keith, a regular office worker from Earth, suddenly transmigrates to the world of the novel he had been reading for the past decade. The new world, which was also called Earth,  was slightly different. 

People with various powers existed who were called awakeners, making this world comparatively dangerous and also mysterious. While he was thrown into the novel's world, he was also given a mystical ability to grant systems to other people. 

Armed with his special ability, he slowly climbs up the power ladder by taking "taxes" from the people he would give systems to. The only question that remained, was what would a realistic normal man, when faced with a similar minded protagonist, do when their goals opposed each other.

God of Systems: Maker of Heroes and Villains

The servants hurriedly cleaned up all the mess that had been created and while the atmosphere wasn't as good as before, it was slowly recovering.

Keith decided to take a break for a few minutes since it wouldn't really be a good thing for the nobles to see him dance again.

He socialized with multiple people whom Mathew introduced and just as it was getting a bit too tiring, he saw Clara grab his hand and pull him away from the group of ladies.

"Sorry, but this guy here promised me a dance so I'll be taking him with me for a while." she said.

It wasn't a request but a statement. The ladies complained but Clara simply pulled Keith back to the center of the stage before she looked up at him.

"Thank you for saving me." he said as he held her hands.

Clara smirked before hitting his chin with her forehead, "You looked like you were enjoying their company a lot."

"Gotta pretend, right? That's what Amelia taught us."

Amelia's Old Appearance?