In a recent interview with TV Daily, Roh Ji Hoon named the female singers he wanted to have a duet with!

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He stated, "I've thought a lot about collaborating on a song with a female singer, but I ended up singing alone.  If I got the chance, I want to try singing with G.NA or IU."  He reasoned, "I feel like their vocal tones match mine well.  I didn't know this, but I've heard I have a sweet voice.  IU and G.NA have clear and cool vocal tones that give off a delicate vibe, so I think they'd match me well."

He even revealed that he had already written songs for them!  "I want to go for the second 'Some,'" he said with ambition.