Need something with a happy ending and heavy romance, Legend of the Blue Sea or Goblin?

Oooo, thank you all for commenting! I was really upset because there has been a huge grin on my face since watching Goblin.

Both are great. Goblin has more emotional scenes imo, but has a happy ending. So if you're into the emotional stuff do try it. It's also slightly comedic and it can be funny.

It's going to depend on your tastes. If you like Love From Another Star because of Ji-Hyun then she's just as funny playing someone new to the human world as she was playing the neurotic starlet.

I personally preferred Goblin because I liked the music, visual settings and heavier feel to the show. It's a darker, heavier show and then there's humor whereas I feel that Legend of the Blue Sea is lighter and more humorous and goes darker for periods of time. It's the opposite sides of the same coin.

So for me I put Goblin above Love From Another Star and I put Legend of the Blue Sea below both of them. But it's not a large gap between the three. 

GOBLIN ~ MUST WATCH !!!!

Both are good dramas, but I agree with Nakshen and think LOTBS fits your request better.