One of the most popular girl groups in 2012 - Sistar, cried on stage because of the cold reaction from audience.

Sistar recently made their special appearance in MNET's "School of Rock - Energy Attack". Idol stars will have the chance to visit  high schools and colleges in Korea and hold surprise events for students.

Sistar made their surprise visit to Gyeonggi Suwon high school. All the members were very excited upon the moment they went on the stage to surprise the students. As always, they completed a wonderful stage, however the students didn't react to the girls' performance, all went silently without any response. At that moment, Sistar members became panicked and they shed tears on stage. The students then surprised the girls with a performance.

This special episode will be broadcasted on January 6th at 8:30 pm kst.

Written by Clover @ DKPOPNEWS.NET