Both are about higher beings. The female lead in Goblin is "the Goblin's Bride" as I recall it..
Honestly I'm still in the process of finishing this drama (episode 12) but I realized the similarities as soon as the first episode started. The visual editing is very similar... male lead is a higher being, 2nd male lead is also a higher being And both are similar in that their life's story is super sad and unfotunate. female leads are both 'cursed' I would put it..
The Bride of Habaek is lacking compared to Goblin. But in my opinion,The Bride of Habaek is still a good one on it's own. I guess everyone had high expectations after Goblin. I for one was excited to see the cast in The Bride of Habaek, and it's mainly my reason for even watching it. Personally I don't hate the plot, in fact I like how it's a bit lighter than Goblin (Goblin will absolutely make you cry a river lol so get the tissue box out)