The MCs got busy measuring the body sizes of all the guests, which included Yubin, Song Hae Na, Yang Jung Won, and Kang Ye Bin.
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When it was Yubin's turn, the MCs used a tape measure to roughly estimate the idol's waist size which turned out to be around 22.5 inches. The MCs then proceeded to measure Park Na Rae's thigh size for comparison, which turned out to be 24 inches.
Yubin probably works really hard to maintain her bod, so props to her!