Girl group SECRET's member Song Jieun revealed her shining beauty.

On Feb. 3, Song Jieun posted on her Instagram, "SECRET Time and Sol Bang Wool who came to 'Idol Star Athletics', thank you. I knocked out as soon as we got back to our dorm last night" along with a picture.

In the picture, Song Jieun has her long hair down and is looking at the camera with her big, glittering eyes.

SECRET participated in the MBC "Idol Star Athletics" along with many other idol groups.