Return to the Zhou Dynasty and Become Emperor

The writing is so messy! When the protagonist first met the Emperor of Zhou, he was not introduced as the founding emperor at the beginning. All the vassal kings in various places were his sons and enfeoffed by him! How come when it comes to those feudal kings, it seems to have become something they have inherited from generation to generation! Is the era the author is writing about our previous era or another dynasty in another parallel world that he has traveled through. At first I thought it was a dynasty from another world, but it looks more and more like the Spring and Autumn and Warring States era of Emperor Zhou before us. Anyway, it's so chaotic. One moment it's written like this, and another moment it's that way! The sword of a vassal king can also be called the Emperor's Sword, so how many Emperor's Swords are there? It's really a mess!