Fun on the set! Actors Joo Won, f(x)’s Sulli, Ahn Jae Hyun, and Park Se Young seemed to be having a blast filming their newest movie Fashion King. Star Kim Sung Oh even became part of the crew! Photos depicting their intense and joyous filming were released to the media today.

In the series of behind-the-scenes images, the cast enjoys being part of a massive crowd, and Joo Won and Sulli smile while bundling up in long down-filled puffer coats between scenes. Additional photos show the main cast focusing intently on mastering their roles, and Kim Sung Oh in full stage makeup while holding sound equipment and monitoring a scene. 

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Fashion King is about a high school student's attempt to be popular by dating a pretty female peer. Fashion plays a major role in the plot.

The movie, which was released last week, is currently playing in theaters in South Korea.