Because apparently Ahn Jaewook can.
Appearing as a guest on “Delicious Invitation” on July 2nd, the question of “Do you have an SNSD member you can contact immediately?” came up. He picked up the phone and called Sooyoung, who answered. MC Shin DongYeop questioned whether it was really Sooyoung or not, which was proved when Sooyoung sang.
Sooyoung commented that Ahn Jaewook used to perform with her older sister.
Source: TV report, Arts News, Soshified
Posted By: dreadtech@snsdkorean
SNSD Korean 
Woot, he is a really lucky guy 😀
I wish I can call Sooyoung anytime I want >.<
To able to call any snsd member would be considered very lucky.
why does she always get the handsome older men?…i’m jealous!
But i wish she can meet younger man than older.it look cool,if she be with …^,^ annyeong
YES! Oh so jealous. Soooo. I love her.
mmm Ahjusshi~
I RILLY LOVE SNSD!!!!MY IDOLS
If only i have Sooyoung’s number… Bet it will be awesome 😀
soooooooooooooo i love you!!