On the October 5 broadcast of 'Radio Star', rapper Kisum revealed the story behind her rap battle with Jessi on 'Unpretty Rapstar'.

Kisum first admitted, "Honestly, she's scary. I didn't know her very well at the time so it was even scarier." She then explained how she overcame her fear of Jessi, and said, "I cut out life-size pictures of Jessi's face and had it taped in my room, in the bathroom, and just everywhere. I trained myself that way and it was actually effective. I wasn't scared of her at all on stage."

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Kim Gu Ra jokingly asked, "Did you spit on the pictures too?", which Kisum also humorously responded, "I did doodle on them because if I spit on them I would have to clean it up."