On the most recent episode of 'Radio Star' aired on May 4, Kyuhyun revealed why he had to undergo a second double-eyelid surgery. 

Kyuhyun explained, "To have a more soft impression, a double-eyelid surgery was suggested by my label. So I got a surgery about 5 years before my debut, but then it seemed like it was disappearing." 

He continued, "At the time I kind of wished for it to disappear, because guys with no double-eyelid was becoming a trend. Then it really disappeared, and it just didn't look right even to myself. It was awkward without it after having it for awhile. So I went back and got a retouch surgery that took about 10 minutes." 

Kim Gu Ra then teased Kyuhyun by calling him the Kwanghee of 'Radio Star', since he is the only one who has undergone cosmetic surgery of the 4 MCs. Ultimately, Kyuhyun's behind story of his double eyelid surgery led to much laughter.