On January 4th, B1A4 came out to play in Hongdae for a recording of 'Guerilla Concert'. Despite little to zero promotions prior to the event, a crowd of 2,000 gathered around the area, causing traffic to come to a still. Fans who attended the show immediately uploaded pictures onto blogs, Twitter, and other community sites after the performances. This 'Guerilla Concert' event was specially organized by Mnet's 'Wide Entertainment News'.  The members were divided into several teams as they headed individually towards the event location.  Jin Young and Gongchan were grouped together to ride the subway, while CNU and Baro rode the bus together. Finally Sandeul commuted to the concert alone in a van. According to reports, hundreds of fans were already present before the members' arrival, as most learned about the concert through B1A4's social networking site, three hours prior to their arrival. B1a4 performed "O.K" and "Beautiful Target" at the concert while Sandeul did a solo. Member Gongchan also treated fans with a cute 5-set aegyo stint. You can check out the concert in full when it airs on 'Wide Entertainment News' on the 6th. Meanwhile, check out a fancam from the concert below! Source + Photos: bntnews via Nate