IU answered the questions of fans who have been patiently waiting for her comeback through LOEN's 'Ask In A Box'!

SEE ALSO: IU to become the first Korean solo artist to hold a show at the Philippine Arena in June

IU shared how she feels like she debuted all over again for her recent comeback. She also explained what the ''ompaloompa doom dubiduba doom" sound comes from in "The Red Shoes". IU previously revealed that she went on a diet to lose the weight she gained while filming her drama and shared her dieting tips including how to go on a water diet. She also serenaded a fan with a special birthday song.

Learn the behind-the-scenes stories behind IU's 'red shoes' in the interview above!