"I truly have nothing but gratitude for my unnies. I’m just so thankful and I really can’t say anything other than just thank you." —Seohyun Seo Ju-hyun (born June 28, 1991), known professionally by her stage psuedoneym, Seohyun, is a South Korean singer and actress. She is a member of K-pop girl groups, Girls' Generation and TaeTiSeo, as a main vocalist and dancer in both groups. Seohyun was discovered at the "2003 SM Casting System". Seohyun is the "maknae" or youngest of the group, and was an SM Entertainment trainee for six years and six months.