In the recent 'Running Man' recording, Super Junior's Siwon, SHINee's Minho, Wonder Girls' Sohee, f(x)'s Sulli, and SISTAR's Hyorin appeared together as a team to compete in the race showdown. The opening recording was held at the entrance of Gimpo Airport, and the 'Running Man' members couldn't hide their happiness as they greeted the idol stars. One of the challenges was called the 'Arithmetic Race' as it involved finding numbers and math symbols, and combine them to complete the mission. They were also seen singing at a recording of '1000 Songs Challenge' at the SBS studio to complete another mission. Catch the episode on January 1st, 2012 to usher in the new year with a bang! Source: Osen via Nate