Practice era was the starting point

Practice era was the starting point of YoonYul.
At almost same time Yoona and Yoona as known as YoonYul became SM trainee. Although Yuri was older and entered SM earlier but they got along so well with each other immediately.
There was incident threatened their friendship among YoonYul who share one rooms. They were supposed to battle at Mon/Tue drama aired from March in Korea. Yoona appeared on KBS drama "love rain" while Yuri on SBS "fashion king". They got many question whether they were conscious of the other at many places because SNSD members would appear on TV at the same time range. But they answered that they wasn't conscious at all clearly. It said Yoona succeeded as actress earlier gave many advice to Yuri. YoonYul has high fellow feeling.