I really like historical dramas too. Here are my faves.
Moon Embracing the Sun- Historical romance and fantasy.
Eternal Love aka. Ten Miles of Peach Blossoms- Fantasy with a historical setting.
Queen In Hyun's Man- Time travel, but they spend a significan portion of the drama in the Joseon era.
Love in the Moonlight aka. Moonlight Drawn by Clouds- Historical romance.
Scarlet Heart Ryeo-Historical and political.
Lost Love in Times- Fantasy with historical setting.
The Eternal Love-Time travel but the times in the present are just a few minutes of the drama.
My Only Love Song- Another time travel that takes place mostly in the past. The comedy is great and the kisses are amazing.
My Sassy Girl- Historical romantic comedy.
Scholar Who Walks the Night-Fantasy (vampire) historical romance.
Snow Lotus- Is a two episode drama about reincarnation, so you get to see their past and present lives. It has an amazing plot twist that I did not see coming, and I'm usually great at guessing plot twists.
Sungkyunkwan Scandal- Cross-dressing historical drama, one of my all time favorites and I just re-watched it a couple of days ago.
The King in Love- History and politics.
Ruler: Master of the Mask- History and politics with some romance.
The Legend of the Blue Sea-Fantasy romance with a reincarnation plot. It's mostly present time but you do get to see their past.
Splash, Splash Love- Time travel romance, takes place mostly in the past.