SECRET's member Song Jieun showed off her matured beauty.

On October 2, Song Jieun posted on her Instagram, "Messy hair" along with a picture.

In the picture, Song Jieun has messy brown hair, making a seductive look at the camera. Her sexy body was also revealed through the tight shirt she is wearing.

Internet users who saw this commented, "So pretty," "How beautiful," etc.

Song Jieun will be releasing her first mini album 25 on October 14.