세계관 = World view/concept, from now on, we will be using the word "world view" instead of "concept". We have been using "concept" up until now, but it's not quite the literal translation. There's in fact no direct translation to the word +_+ but 세계관 basically means the overarching "theme" of the group/overarching concept/origin/etc. in includes everything that is related to the group's concept/planning/origins/actions...