Korean words that have become widely known through K-pop music include terms of affection like "saranghae" (I love you), behaviors like "aegyo" (acting cute), honorifics like "oppa" (older brother), phrases for emotions like "molla" (I don't know), "aigoo" (oh my), and terms of endearment between couples like "jagiya" (honey). These words provide insights into Korean language and culture that have spread through popular music globally.