Heir to the Kingdom of 1.4 billion people

Xia Mingyu accidentally traveled from Blue Star to a different world similar to the fantasy Middle Ages, but everyone has a line of identity labels on their heads.
Those labeled as civilians: struggling all their lives for a few pieces of black bread and a small house, working hard all day but feeling anxious and uneasy.
Noble Label: Born with wealth, good looks and the power to tear up the law, just need to enjoy life to the fullest.
King Tagger: I don't eat beef.
Xia Mingyu, who was used to being a slave, thought that he would have to continue being a slave even after traveling through time, but he found that there were people kneeling beside him. It turned out that the label on his head was - the heir to the kingdom of 1.4 billion people!
Xia Mingyu: “???”
No, where did I get such a big kingdom? Wait, in a sense, before crossing over, everyone was a successor...
Several years later, at the founding ceremony, facing the countless eager citizens below, the first and last king, Xia Mingyu, spoke:
“I have a dream that there will be no more serfs, prostitutes, slaves, or any other oppressed people on this land.”
"I have a dream that, on the site of the former slave capital, the children of former slaves will be able to sit on the ground with the children of former nobles, as close as brothers."
“I have a dream that in my country, people will no longer judge a person’s nobility by the labels on their heads, but by the quality of their character and morals.”
...
"My fellow citizens, although the road ahead is difficult and filled with temptations, please lend me your strength and join me in realizing these dreams!"
(Note: The protagonist will send the person who created the prostitute to the guillotine)

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