Taejong Yi Bang Won (2021)

Both dramas are about the rise of Lee Bang Won. He is main lead / main story in "King of Tears", while "My Country" has other main leads (2 young guys) but historical events are same and though as SML Lee Bang Won is one of most memorable, important and deep character.

Both dramas are about the rise of Lee Bang Won. Difference is King of Tears is meant to be a more historical take while 6 Flying Dragons adds some interesting characters.