[Picture] 4Minute's Hyun Ah revealed Krystal's bikini in King Of Idols!

A photo of 4Minute's Hyun Ah pulling f(x)'s Krystal's shirt spreads like wildfire in various korean portal sites.

Take a look at the photo above,the girls were playing at that time and Hyun Ah pulled up Krystal's shirt accidentally.

Hope that incident like this does not happen in the future ^ ^

Credits to f(x) thread @ Baidu for the photo!