Seo In Young's photo during the rehearsal of "Music Core" was released.

On October 15, Seo In Young posted on her Twitter, "During the 'Music Core' rehearsal. I haven't been nervous in a long the~ Hope to see you all soon!" along with a photo.

In the photo, Seo In Young is wearing a colorful jacket and short shorts. She is also wearing unique looking printed leggings that show off her fashion style.

Internet users commented, "She got even prettier" and "Her leggings are going to get so popular."

Seo In Young will make her comeback on October 18 on Mnet "M! Countdown."