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On the March 17th airing of SBS PowerFM's 'Cultwo Show', Phantom's Hanhae and Red Velvet appeared as guests. During the radio show, the DJs received a tip from fans, who pointed out that Hanhae had been a rap teacher to Moon Byul.

When asked to confirm, Hanhae blushed, saying, "How did you know? I've never talked about it on broadcast before." The MC just relayed that it was a tip from a fan, making the guests laugh. Red Velvet's Wendy also praised Hanhae's rap skills, saying, "I would love to learn rap from Hanhae." 

Now we know where Moon Byul's great rap skills come from!