SEE ALSO: Seo In Guk shows off his ice hockey skills in stills for 'High School King'

Fans got to see a never-before-seen side of Seo In Guk who surprised them with his sexy body waves and hip shaking. Lee Ha Na also wasn't afraid to let loose with her stiff yet adorable dance moves that made even Seo In Guk break out into a big smile.

As mentioned previously, Seo In Guk plays the lead role of Lee Min Suk who lives a double life as a high school student and company director at just 18 years of age. 'High School King'�is set to premiere following 'Witch's Romance' on June 16 at 11 PM KST!

Check out their dance battle!