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At the very top of the food chain, there was the King. Next came the aristocrats and then the commoners. Silla had what was called the "Bone Rank System" which was a system that broke down the social status of each aristocrat.

Watchman http://www.thekoreaguide.com/2011/12/18/history-of-korea-through-korean-dolls/

The King and Queen were at the top of the social ladder in Goguryeo. The social ladder went from the King, at the top, to the aristocrats, commoners and then slaves at the bottom of the chain.