I was on weibo and I found somethings about them .

KTR 120320 

They were on the topic of legs . Ryeowook mention that He once ask Yoona why is her legs so beautiful , Yoona said  her legs isnt pretty at all . Ryeowook then added , my legs arent slim at all .

Gaon awards . 

SJ was receiving an award , Ryeowook laughed at Yoona while he was on stage because Yoona was alone 

Unknown source cant find the program 

Ryeowook once ask Yoona why is she so pretty . And he would like to be on wgm with her .

Ryeowook once misheard Luna as Yoona

Ryeowook and Yoona have close relationships with each other off cam .