Soyu and Kwon Jung Yeol graced the viewers of KBS 2TV 'Yoo Hee Yeol's Sketchbook' with their presence on October 3! �The two had recently dropped their sweet duet, "Lean On Me," which will get you humming along with your eyes closed. Surprisingly, though, Soyu revealed that the song originally had quite the different effect...

She stated regarding the collaboration, "I originally sang it with [a thinner voice]," and provided a sample. �She continued, "However, it came off sounding too erotic. �That's why I sang it again. �Because of this problem, work [on the song] took a long time." �Yoo Hee Yeol hilariously stated, "I like how you sang it before."

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On top of that, Kwon Jung Yeol stated, "It was not awkward because I imagined the picture [we would have together] since Soyu first started this project." �Soyu added, "I also thought that I would be collaborating with Kwon Jung Yeol. �Because his voice is so nice."

Kwon Jung Yeol, who had a collaborative stage with Hyunah before Soyu, was asked, "Why do girl groups cling onto you?" and he replied, "I was perfectly still. �They wanted me. There are more of them." �Why don't you give the secret of your charms to other men?

Check out their performances, including "Some" and "Who's Your Mama," below!

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