She is known now as 'The Nation's Sweetheart'. With the success of her 2011 albums, Real+ and Last Fantasy, IU established herself as a formidable force on the music charts of her native country and further cemented her girl next door image as Korea's 'little sister'.

'Good Day' went on to spend five consecutive weeks at the top position of South Korea's Gaon Digital Chart, and in 2019, it was ranked number one on Billboard's '100 Greatest K-Pop Songs of the 2010s' list. Although her follow-up albums, Growing Up and IU.IM, brought mainstream success, it was after the release of ' Good Day' ( Korean: 좋은 날), the lead single from her 2010 album Real, that she achieved national stardom. The name IU is a combination of 'I' and 'you' meaning 'you and I become one through music.' She signed with Kakao M (formerly LOEN Entertainment, now Kakao Entertainment) in 2007 as a trainee and debuted as a singer at the age of fifteen with her first mini album Lost and Found (2008). Lee Ji-eun ( Korean: 이지은 born May 16, 1993), known professionally as IU ( Korean: 아이유), is a South Korean singer-songwriter and actress.

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