On the June 30 airing of 'Song Eun Yi and Kim Sook's Unnies' Radio', E-Tribe revealed, "Lee Hyori's 'U-Go-Girl' was originally thrown away in the trash. Lee Hyori's head choreographer found the song in the trash can next to Lee Hyori's computer and strongly recommended we record it, and that's how it came out to the world."
The producer also revealed that the hit song gifted him with financial success. He explained, "I was able to end my financial difficulties due to 'U-Go-Girl's immense popularity, and also got married."
Definitely one of the most memorable hits of K-Pop!