Goong?

Since you don't look especially to manga only, i can suggest some kdrama

City Hall is a pretty good drama (20 episodes, 1h each)

Yi San or Dong Yi if you search an historical politic (i think Yi San is better in politic and history but Dong Yi have a better romantic plot i think. but both have a similar plot and take place in the same era, Yi San is the great grandchild of Dong Yi) (77 episodes for Yi San and 60 for Dong Yi, 1h each)

There is always Goong or My Princess but i think it's more for comedy than really politic.


and for anime : +1 for Crest/Banner of the stars (Seikai no Monshou/Senki, 4 seasons)
or juuni Kokki

Actually Zettai Heiwa Daisakusen isn't about an arranged marriage [unless you count them arranging it themselves]. They wanted to end the war and so they FAKE getting engaged, they have to pretend to like each other in public, but in real life she hates him [He likes her]. The story follows them as she starts to realize he's not as bad as she first thought and all the political backdoor dealing and assassination attempts that happen because of them.

Slightly different... There were rather funny parts, but mostly it's a good story.

Not saying you have to change your mind, but I have thing about people not reading a story because they think it's something it's not.

Rose of Versailles if you don't mind classic ^^ definitely worth to try

I've seen the anime. It's what I'm looking for though. Thanks for the suggestion!

Princess, although i only read up to vol 4
Four Daughters of Armian

No, I'm looking for something more dramatic and by the looks of it it's more into comedy than what I'm looking for right now. Thanks though!

Actually Goong is very dramatic, maybe a little TOO dramatic. At least try to first few chapters...

Calling Goong dramatic is like saying the ocean is a bit damp. It's really awful, btw. ;p