
Krystal had been recently cast for a role of a girl named Yoona, which YoonA of SNSD (the matching name is entirely coincidental) has originally been penciled in for. However, due to inevitable scheduling conflicts, YoonA had to bow out.
The production team believed Krystal was an ideal replacement, with her unique style and feel. Many netizens also agreed, as they believed that Krystal shares many identical features with YoonA, both personality and appearance-wise.
After learning that she’s actually taken YoonA’s role, Krystal felt apologetic and expressed her feelings publicly for her senior

He wrote, “My ’sibling’ Sulli came all the way to China despite her busy schedule! She always does her best in anything, and is full of loyalty. She may look like a little child, but she is a thoughtful dongseng.”
The фото was taken on the 23rd during ’Super Junior’s Asia Tour Beijing Concert,’ where Sulli made an appearance during Heechul’s solo performance.
Netizens who have seen this фото have commented, “Heechul and Sulli seem like siblings”, “They look good together”, and “Cute couple”.