Hey so I've recently watched my first historical drama, Scarlet Heart Ryeo, and I loved it. I then caught up to Hwarang which I also loved. I was wondering if someone could please recommend good tragedy and romance historical dramas of the same vein.

Shine or Go Crazy has a bittersweet ending. It's also loosely based on history of same period as Scarlet Heart Ryeo.
Scholar Who Walks The Night! 
Princess Man, it's like Romeo and Juliet sageuk time
http://mydramalist.com/2591-the-princess-man
Empress Ki would be your next best bet I'd guess. The Princess' Man (a Romeo-Juliet tale) is what got me into saeguks in the first place. Enjoy~ ^^
http://mydramalist.com/2785-deep-rooted-tree
Six Flying Dragons
Warrior Baek Dong Soo
Hwang Jin Yi
Iljimae
Joeson Gunman
Nirvana In Fire
The Royal Gambler/Jackpot
I'm really tempted to recommend Queen Seondeok. It's 62-episode long, though, and it's heavier on  the political stuff than romance--at least much heavier than Scarlet Heart Ryeo and Hwarang. Oh, and maybe Ja Myung Go (39 episodes)?
Empress Ki
The Princess' Man
Splash Splash Love [2 episode special so it's a quick but amazing watch]
Dong Yi
Empress Ki
The Princess' Man
Dong Yi
The moon that embraces the sun
Warrior Baek Dong Soo
bridal mask
Both Scarlett Heart and Hwarang have a strong romantic story line, so I also vote for Empress Ki.