This should also include: "What are you doing, younger brother?" Korean is a language where it is polite to address people in the third person.
In Chinese, "younger brother" and "little brother" have verrrrrry different meanings... nom' sayin'? I don't know, but Korean might have a similar meaning as Chinese for "little brother"...
Off topic but "nom' sayin'" is a funny auditory illusion. The brain fills in an "I" even if I say it myself.