Dongsaeng “Dongsaeng” is a Korean word for a younger sibling. It can be used for both boys and girls. SNSD's Taeyeon could call Seohyun "dongsaeng" since she is younger than her; Credit: Kpoplive.com. Advertisements Share this:FacebookEmailTwitterMoreTumblrGoogleRedditLinkedInLike this:Like Loading... Related This entry was posted in Kpop 101: #-D and tagged dongsaeng. Bookmark the permalink.