f(x) Krystal's 11-Shape Abs "Best Body Of Girl Groups"

Krystal's 11-shaped abs are becoming an issue.

Recently in an online community forum, a picture from past f(x) concerts was posted under 'Krystal 11-shaped abs.'

Krystal, who especially wore many outfits that revealed her stomach, surprised many with her 11-shaped clear abs.

Also, in KBS 2TV "Music Bank" aired yesterday, the 1994 girl group members showed a carol song medley. On this day, Krystal showed off a perfect body once again, wearing a red knit that showed her belly.

Photo Credit: Online Community