One is an overlord who was born with a silver spoon in his mouth, and the other is a humble slave who doesn't even have a last name, but they came together because of a word to change the world.
"The villain is just a slave. He really doesn't understand the big principles of the world."
"Then follow me and I will show you the world."
It can be regarded as a prequel to The Cheating Childhood Sweethearts. In fact, it is just similar in setting, and there is no big connection in content.