Almost the same period from the two sides.
Korean and Japan
Very epic and historically truthful.
Watch too
King Gwanggaetto the great
The dream of emperor
Gye baek
The three with deep roots

You will understand Korean history and Mr Sunshine

Very similar history another one similar in tenchijin
Both three are about invasions and war.
About the King's wanting to protect their people
Tenchijin is Japanese with similar history but from the Japanese point of view
Gwanggaeto the Great is almost the same integrity