Kpop 101: #-D Dongsaeng Posted by embeebee on May 19, 2011June 4, 2011 “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. Share this:FacebookEmailTwitterMoreTumblrRedditLinkedInLike this:Like Loading... Related