"누나" is a Korean term used by males to refer to an older sister or an older female friend. It conveys a sense of respect and affection. In Korean culture, family relationships and age hierarchy are significant, and using the correct terms helps maintain social harmony. In addition to its familial meaning, "누나" can also be used in various contexts, such as in K-dramas or K-pop, where younger males may address older female idols or characters as "누나." This usage reflects the close-knit relationships often portrayed in Korean media.