G-Friend's Yerin surprised everybody with her comedic 'kkab' dance on this weekend's 'Running Man,' proving to be a secret and deadly variety show weapon.  Despite the group's and her own sweet and cute image, with her eye-smiling for most of the episode, she turned up the bizarre for a hilarious portion in the dance-off by the swimming pool later in the episode.

Whether she's nodding along, firing imaginary bullets at the camera (and bullets of love at viewers' hearts), or getting so into it she knees herself--HARD--in the nose, she has everybody in stitches.  As the music changes, she suddenly goes back to the innocent and girly G-Friend image as she dances to their song "Glass Bead," but when the music changes again, she proves nothing catches her off guard as she returns to being weird--and everybody loves it.

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Looks like fans will be seeing more of Yerin on variety because she's pure variety gold. Check out the hilarious scene above!