Please, do not take this as an attempt to put you down, or mock you. It is not, I am simply passing on what I think when I read your post. If it offends, I apologize, but I think it is better to be honest than give false praise, and leave you committing the same grammatical errors. If you have come here to teach and share, you should also be prepared to learn from constructive criticism.
It is very difficult for a native English speaker to follow what you write.
It reads like a translation made by bad translating software. I am a fan of history, and am interested in other cultures, but, it is very difficult to follow what you write and understand what you mean.
I would recommend that you practice conversational English before posting in what is obviously not your native tongue.
Please, keep sharing, and work on that English.
Be well.
RE: Where kings of Choson Dynasty were working at