Heir to a Kingdom of 1.4 Billion Citizens

Xian unexpectedly transmigrated from Earth to a fantasy medieval-like world, where everyone had a label above their head indicating their status.

Those with the 'Commoner' label: They struggle their entire lives for a few loaves of black bread and a small house, toiling all day yet living in constant anxiety.

Those with the 'Noble' label: Born with wealth, handsome appearances, and the power to tear apart the law, they only need to enjoy life to the fullest.

Those with the 'King' label: I don't eat beef.

Having been used to being a workhorse, Xian thought he would continue to be one even after transmigrating. However, he discovered that people were kneeling all around him. It turned out that the label above his head was actually—Heir to a Kingdom of 1.4 Billion Citizens!

Xian: "???"

Wait, where did I get such a big kingdom? Wait a minute, in a sense, everyone was an heir before the transmigration...

Several years later, at the founding ceremony, facing countless eagerly anticipating citizens below, Xian, the first and last king, spoke:

"I have a dream that there will be no more serfs, prostitutes, slaves, or any oppressed people in this land."

"I have a dream that on the ruins of the former slave capital, the children of former slaves can sit side by side with the children of former nobles, as close as siblings."

"I have a dream that in my country, no one will rely on the label above their head to distinguish a person's nobility, but rather on the merits of their character and morality."

....

"My fellow citizens, although the road ahead is difficult and full of temptations, please lend me your strength and work with me to realize these dreams!"

(Note: The protagonist will send those who create prostitutes to the guillotine.)