On that post from December 16th, commenter Jim writes:
I went there yesterday, pretty amazing but was the coldest day of the year so bad timing on my part. My 3 year old absolutely loved it and I was impressed with the work that must have gone into it.
And Mr Rocky Top:
I went there last year the day after Christmas. The traffic wasn't bad, and there weren't that many people there. I would definitely recommend it as something Christmasy to experience.
I'd also like to repost a picture from a shoot last Christmas Eve, I think some of the coolest pictures I've seen in Korea:
Those were taken at the Sea World in Seoul's 63 Building. More available via a Naver news search.