f(x) member Krystal's high school yearbook photo was recently revealed on the internet. In the photo, Krystal looks young and innocent with her long, straight black hair and milky skin, smiling gently. In the photo, she looks the same as she does now, and it further proves that she is a true natural beauty. Along with her yearbook photo, another photo was released of when Krystal was only 11 years old. She has the same face only younger, and her eyes still reveal her beauty. Netizens remarked that "she looks exactly the same", and "Pretty, natural beauty". Krystal is currently cast in MBC's 'High Kick! Counter-attack of the Short Legs' which aired its pilot episode on the 19th. Source: Nate