Jisook of girl group Rainbow opened up about her former boyfriend.

On the episode of SBS 'Strong Heart' that aired on February 14th, Jisook remarked, "There is a guy I met while I was a trainee, and we dated for a while."

"He is now the member of a 5-member boy group," she continued, surprising everyone on set.

When the other guests pressed her for details, Jisook added, "He has double eye-lids and I dated him for about a year. Now, we're just good friends."

"He was a big help to me during my difficult trainee days, and I was thankful to have met him," she remarked.

Hmm, who do you think it could be? Let us know your speculations below!

Source & Image: XportsNews via Nate