B2ST's Yoon Doojoon kept his nickname as "Clumsy Doojoon" firmly in place. On February 18th, Doojoon slipped and fell during the opening performance of their encore concert, "Welcome Back to B2ST Airline" - which was held at the Seoul Olympic Gymnastics Stadium in Bangi-dong, Songpa-gu. Doojoon was running towards the center stage when he lost his balance right in front of the fans in the standing section, surprising everyone. He got up quickly and continued as if nothing had happened. Doojoon stated, "Following the concert last December, I fell again. I'm so embarrassed, I could die." To this statement, fellow team member Son Dongwoon responded, "My pants ripped" - amusing the audience. Also, the sequel to the "Beautiful" music video featuring Apink's Son Na Eun was revealed during the concert - raising much interest. Supreme Team's Simon D, F.T. Island's Lee Jaejin, and others, attended the concert on this day. B2ST will continue their second solo concert until the 19th. Source: Newsen via Joins! MSN