TWICE's Sana previously went viral with her adorable "Sha sha sha" part in "Cheer Up." She talked about this on the November 16 airing of MBC's 'Radio Star.'

The MCs said to her, "You're the heroine of the 'Sha sha sha' wave.  I heard that you thought people were making fun of you at first."

She said, "That's right.  People kept looking at me and going, 'Sha sha sha.'  The original lyrics stated 'Shy shy shy,' but I thought, 'Why are they pronouncing it like that? I'm working so hard.'  I felt like I was being made fun of.  Because I couldn't pronounce it properly.  I felt wronged," making everyone laugh.