I am trying to get in a Christmas-y mood and I was wondering that in such a wide web of korean dramas, there must be multiple cute Christmas scenes or Christmas-dedicated episodes. But for some reason, the only one that comes to my mind at the time is the Goblin one. Can you guys come up with something similar for me?

I can only think of a couple, and they are probably not cute in the way you describe, haha.  Also they are both pretty old.

Invincible Lee Pyung Kang had some Christmas sleigh ride thing.  And Once Upon a Time in Saengchori had an episode or two around Christmas where they decorated their house and office.  Don't remember if there was anything else that really had any bearing on the story, though. 

It does seem like there should be more, but I am drawing a blank other than these.  

My Long-Awaited Love Story

Oh My Venus had some Christmas scenes in it.  Tree decorating and a party too...if I remember correctly.