Singer IU�explained the reason the Sadako dance she did back in 2012 on 'Yoo Hee Yeol's Sketchbook'.

On the 100th episode special, Yoo Hee Yeol�revealed past unseen footage of IU from May of last year. She was singing when her voice suddenly cracked. At the time, IU apologized,�saying, "I'm sorry. I'm sorry."�

Her apology wasn't the strange thing, however. What was a little odd was when she suddenly broke into a 'Sadako dance'. Apparently, the singer was trying to make up for her little mistake, and the crowd absolutely loved it.�

Yoo Hee Yeol commented, "IU, you've matured into an adult, but you've also matured musically," while IU said, "I think of 'Sketchbook' first when it comes to my comebacks. It's a place I want to go even though I'm scared of it."

Check out IU's full clip above!

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