Back when both of them were starring on 'Barefoot Friends', a rumor had spread that the duo were actually dating. According to rumors, Kim Hyun Joong had introduced UEE to his friends as his girlfriend. Even though the rumors quieted after the show ended, it still pops up from time to time.
In an interview he had with Star Today, he was asked about the rumors. He answered, "It's not true at all. To be honest, I trusted these rumors out of instinct. But now that I became one of the subjects, I realized they're not believable. I heard through the rumors that I was dating UEE, and we laughed together when we saw it. After that, the staff kept teasing us, so I jokingly said 'she's my girlfriend', and that became the fuel for another round of rumors. It's a scary world."
He added, "We were all close during the filming, but I don't think I could ever be dating UEE like the rumors suggest."