Psy was one of the guests on the December 19 airing of 'Sketchbook,' talking about the slump he experienced after the explosive success of "Gangnam Style." 

Yoo Hee Yeol had asked the singer, "Is there every a moment when even the godly Psy feels nervous on stage?" Psy replied, "After 'Gangnam Style' was successful, I performed at City Hall, and honestly, I felt scared. There were 100,000 people there and I thought I'm really in big trouble. What a singer needs is support but it felt like they were cheering for an athlete. There is a chance I may not score, so I thought wouldn't they be disappointed. It was hard. 

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He continued, "I had started [the job] for laughs but one day there were 100,000 people at city hall, and among them, there were even elderly folk. After the success of 'Champion,' I experienced a ten-year slump. I think it'll take twenty years to overcome the 'Gangnam Style's slump. After 'Gangnam Style's success, the 'American disease' followed me. I revamped all the songs I wrote to release a new album," discussing all the hard work and some of the emotional turmoil he had gone through for his comeback.