SK historical drama

Faith
Moon Lovers
The Royal Gambler^
+1 Rebel: The Thief that Stole the People
+1 Six Flying Dragons
Iljimae
Empress Ki
Arang and the Magistrate
Joeson Gunman
Queen In Hyun's Man
Hwarang*
Chuno*
Warrior Baek Dong Soo*
Hwang Jin Yi^
Scholar Who Walks the Night*
Night Watchman's Journal^

*I didn't LOVE them but lots of people did
^ I liked them more than a lot of people but they didn't rate well

Sungkyunkwan Scandal has the bromance to end all bromances in Korean historical dramas (Jumong has an adorable one as well, but it's only one subplot among many, many other narrative threads).