Korean foods can actually have quite a bit of oil in them. Many recipes call for sesame oil because of the flavor it adds, and we all know oil is very calorie-dense. In addition, Koreans typically share whatever they order, and portion sizes are larger to accommodate that. If you have no one to share food with, is very easy to overeat.  I only know all of this because I love Korean food, but I have to eat at home due to my shellfish allergy. Having to make the food myself, I just stand there like "I can't eat all of this. How do I cut this down?"