f(x) Krystal has always been regarded by fans as one of the female idols with the best proportions for having a fantastic X-Line.
An X-Line is a Korean term for a certain hip waist ratio that results in an hourglass figure. In these photos the X-lines can clearly be seen while she dancing gracefully. This one is for all the Krystal fans out there! Check out these 18 Photos Prove The Krystal Has The Best X-Line!