The latest episode of 'Running Man' turned into a veritable K-Pop concert with the appearance of some of the biggest idol names in Hallyu!

With 2PM, B2ST, SISTAR, Girl's Day, MBLAQ, A Pink, and INFINITE in attendance, the cast members took one idol group each under their wing to crown them the title of the 'Top K-Pop Star'.

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With games such as a water edition of 'King of the Hill' and the return of the famous 'BLOP jump', the cast and guests found themselves subjected to some of the most physical games yet. The winners would receive a mysterious timestamp, with the score increasing with each team's standing.

The final game was a 'gauntlet'-styled race, with each team taking on a series of challenges under a set time limit determined by their performance in the earlier games. Coming out from behind, Song Ji Hyo and B2ST ended up racing past the heavy favorites, taking the endgame trophy for themselves.

Check out the full episode below!