There's at least three major forms of speaking in Korean based on social hierarchy and familiarity:
-ㅂ니다
-아/어/여요
-아/어/여
Do you know of any other language that does this? I know some languages use honorific words, but they don't speak comprehensively in an elevated or humble or casual forms as in Korean. Does any other language conjugate verbs according to politeness levels?
For example, here are some honorific phrases, but the entire language style is not changed, I think, when speaking further.
English: Hi Sam! Hello Mr. Johnson.
German: Wie geht's du? Wie geht es Ihnen?
Spanish: Como estas? Como esta Usted?