After Super Junior and f(x) took part in the One Heart Big Concert recently, they showed some SM family love and opened a surprise birthday party for Ryeowook who turns 23 on June 21st while on their way back to Seoul! The location of the surprise party was not at a typical or fancy location; instead, it was held at a freeway resting spot. Nonetheless, everyone's mood was in high spirits, making the location brim with love and celebration. Shindong uploaded a picture of this heart-felt birthday celebration onto his Twitter along with the caption, "Celebration of Ryeowook's birthday at a freeway resting spot on our way back from the concert. Thank you so much f(x)." As a plus, Shindong also uploaded before and after clips of Ryeowook being caked.