It has been revealed that the charming high school girls that delivered hints to the SBS 'Running Man' members on the June 10th broadcast of the variety show are actually members of an upcoming girl group.

An insider from idol group INFINITE's agency Woollim Entertainment informed OSEN on June 11th, "A few girl group members from our company who are preparing for their debut featured on 'Running Man' as high school students. Three members in total made an appearance on the episode, and they are all girl group trainees."

Among the three, member Yoo Jiae first made her television debut in 2010 when she made an appearance on Mnet's 'INFINITE! You Are My Oppa'. She has been maintaining a fan base ever since.

Yoo Jiae and the other two girls are collectively being called 'Woollim girl group', and they will be making their debut sometime this year.

Source & Image: OSEN via Nate