Unnie is a Korean honorific that younger women and girls use for an older sister or a close older female friend, and it carries warmth, closeness and respect rather than formality. Online, short clips of the word are widely shared in K-drama and K-pop fan edits, reaction videos and social posts, where a single call can signal affection, teasing or a playful plea. Because the term is instantly recognisable to fans of Korean culture, even without subtitles, it continues to work as a quick emotional shorthand in short-form video.