f(x)'s Amber recently revealed a photo of fellow member Krystal to the public – evidently with great glee as she did so. By tagging the comment, 「Hehe pure Krystal! Hehe [can you tell it's her?] […] Everyone please follow up and support [us] a lot,」 along with the post, she interested many netizens into seeing what she had to say.
In response to the photo itself, netizens wrote back 「so cute, please upload the photo a lot」 and 「SunSoojoung?,」 which is a phrase made up of the Korean word for 「pure」 and Krystal』s real name. Others who remembered that Amber had been recently experiencing issues with her tendon asked, 「Amber onpa, fighting! How about your leg?」 Onpa, which is a phrase the netizens used affectionately on the idol, is a mixture between the Korean words for 「elder sister」 and 「elder brother.」
From the looks of it, it seems that the photo was taken quite a while ago, perhaps before f(x)'s debut. Do you see the resemblance between the present-day Krystal and the one in Amber's picture?