She was a special guest on a recent episode of MBC's 'Quiz to Change the World', where Jo Hye Ryun revealed the interior of her house. But her bathroom had a man's razor in it, surprising the panel.

Seo In Young first asked her what a men's razor was doing there to which Jo Hye Ryun demonstrated how it is used for her armpits. Comedian Jung Joo Ri also honestly commented, "Men's razor shaves better these days. I use it. IU probably does it too."

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MC Lee Hwi Jae protected the nation's little sister telling the comedian, "Don't bother IU", and Moon Hee Jun replied in denial, "IU doesn't have armpit hair." IU wittily replied, "I don't wear tank tops at all." MC Park Mi Sun curiously asked, "So you just don't shave it at all?" Her uncle fans Lee Hwi Jae and Moon Hee Jun came to the the rescue and joked, "Don't bother IU", and "IU doesn't have hair on her underarms", causing everyone to laugh.