If you have one chance to recommend a Cdrama, which one?

A Dutch friend of me has never watched any asian drama. He thinks Games of Thrones is the best serie ever made. I doubt it as I feel like I have experienced better from Asian dramas as a kid/ early teenager. He suddenly asked me what I can recommend. But he doesn’t like foreign spoken languages for a longer time of period that he can’t understand.

I know that any Asian drama has a lot of episodes and I haven’t watched one in a looong time. He wants to give it one chance. I want to show a historical Cdrama, because of my roots and to give him a grasp of the beautiful Chinese ancient time. He doesn’t like too much romantical drama.

Tldr; If you have only ONE chance to show a foreign friend who has never watched a historical Cdrama that is not too romantic loaded, which one would you recommend?