The guests were asked what they thought was the most important body part in the opposite sex.  Kim Ah Joong chose shoulders.  Joo Won honestly said, "I like the stomach . . . I like someone who has a bit of a stomach."  He elaborated that he liked women whose stomach was not flat or skinny, but rather protruded out.  You can watch this in the above video at around the 2:18 mark.

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He added later on, "I don't really like women exposing themselves . . . I'm not a fan of women in skirts . . . Well, it's not that I dislike it, but I prefer women who wear pants all the time."

He was also asked what type of skinship he liked the most and Joo Won said he liked hugs.  He was asked whether he liked back hugs or front hugs more and he chose the latter, saying he liked it because it was warm.