Please watch the video and you'll see how powerful the group is! They were able to gather hundreds of fans in a short span of time not to mention the freezing weather that time. Warning: be prepared for the scream and shouts!
Bad thing was their guerrilla performance caused some traffic but it made many fans happy!
They performed Beautiful Target and OK. And also made all the fans sang the songs for them because the sound wasn't audible.
Related article: Korea.com