On 'Yoo Hee Yeol's Sketchbook', CNBLUE talked about the times when fans threw underwear at them on stage. Minhyuk said, "I've never actually seen it being thrown, but there are times when I saw underwear lying on the stage."

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Jonghyun then added, "Sometimes the underwear gets stuck on my guitar, and it doesn't shake off easily, no matter how hard I try." Yonghwa also made a comment as he said, "I always worry if I should take it off with my hands or not, especially since fans take a lot of pictures nowadays. But in the end I just take it off with my hands."

To this Yoo Hee Yeol jokingly responded, "You guys better not be taking them with you. Make sure you give it back".