[caption id="attachment_344754" align="aligncenter" width="460" caption="4minute's Jihyun and Hong Jin Taek (4minute manager)"][/caption] Idol groups B2ST and 4minute were recently spotted at Gimpo airport, as they headed for the United Cube concert in Japan. The show will be held at the Budokan in Tokyo on August 25th. The artists from Cube Entertainment will also be the first Korean singers to perform in London's Wimbledon Arena on November 19th. United Cube Concerts are different from other idol shows, because they are held more like festivals than large-scale concerts. Concertgoers can expect to see performances from 4minute, B2ST, G.NA and other members of the Cube Entertainment family. Doojoon and G.NA will leave on a later flight due to other schedules. [gallery] Source & Photo: Newsen via Nate