Talented solo singer Seo In Kook honestly confessed that he feels a sort of grief when he hears himself being labeled as an "instant star." On the 18th, the singer made a guest appearance on popular music show 'Yoo Hee Yeol's Sketchbook'. MC Yoo Hee Yeol asked, "People are saying that when you look at Seo In Kook, it seems like he became an instant star overnight. When you hear such things, how do you feel?" Seo In Kook answered cautiously, "Truthfully I feel half touched and half unfair towards it." The male idol then continued, "If you look at it on one end, the moments I appeared on television are everything the public sees about me. Yet the time I spent practicing by myself were the longest. It has been 7 years now since I started attending a professional vocal school and even before then, I practiced singing at home. Since it would be noisy, however, I poked holes through a potato chip container and placed tissues inside to block out the sound. Then I put my mouth to the container and practiced singing every morning." Yoo Hee Yeol then cleverly commented, "If your parents saw you they probably thought that you really liked potato chips. Since you have a potato chip can on your mouth every morning," causing the audience and Seo In Kook to laugh aloud.