Imara:
LOL! I think exactly the same thing about both shows. In fact, Goblin was my first k-drama (until then I only watched japanese things...) and for this reason I continue watching dramas, thinking that perhaps I would find another gem as this one. I haven't watch yet Scarlet Heart Ryeo though.
Scarlet Heart Ryeo is really good, another kdrama I'd recommend maybe I Hear Your Voice. It keeps you very interested and the romance is cute. One that I'd say is Goblin-like quality is Kill Me, Heal Me, is very heartfelt and makes happy at times and makes you cry at others and you really connect with the characters.