The weather has turned cold, why not warm your body up by trying some good Korean soup?
Chinese people believe "Dog for summer, Lamb for winter"
Yet, I havent tried any lamb or dog soup in Korea, but I did enjoy lots of other soup.
Usually when you look at the restaurant menu, the ones ended up with "탕"(Tang) are soup.
My favorite includes:
Samgye-Tang 삼계탕(Jinseng Chicken)
Bugeo-Tang 북어탕(Globe fish)
Seoleong-Tang 설렁탕(Beef)
Daegu-Tang 대구탕(Cod fish)
Kamja-Tang 감자탕 (pork backbone and patato) But keep in mind "목굑탕" is not any soup

Enjoy yourself.