Fresh off a grueling diving challenge, the cast of 'Barefoot Friends' were soon confronted with an entirely new challenge with its own set of problems: a songwriting project!

The brainchild of Kim Hyun Joong, who had always wanted to write his own song, the new task was met with shock and awe from everyone, especially from those cast members who were none too musically inclined.

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As the first step in the songwriting challenge, the individual cast members stood in front of some harsh judges -- including Epik High, Duble Sidekick, and Dynamic Duo -- and competed against each other to be 'casted' under one of the three powerhouse producers to help compose their songs.

Check out the full episode below!