Kangnam was asked a question that got everyone's ears perked up on the December 17 installment of SBS's '100 Year Guest Dear.' �On this day, they gathered to play a game of truth using a truth detector.

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When Kangnam placed his hand atop it, Sung Dae Hyun asked him, "Have you ever dated a girl group member?" and he replied that he hadn't. �However, the lie detecting machine alerted everybody that this was a falsehood! �Afterwards, Kangnam looked taken aback and flustered, making everyone laugh.

Sung Dae Hyun asked, "You really dated someone!" but Kangnam insisted he didn't to the end.