It is possible that IU may choose to retire 'Good Day' from her concert performances in the future.

According to a witness, IU intends to discontinue performing "Good Day" at her concerts.

During a recent episode of SBS Power FM's 'Kim Young Chul's Power FM radio program, special guest producer Crazy Music discussed the song's unique characteristics, including its high pitch and sustained notes, which make it a challenging song to perform. He revealed that during a concert last year, IU informed her audience that it would be her final time performing the song due to the strain it puts on her throat.

"Good Day," which was released in 2010 as part of IU's 3rd mini-album 'Real', has won multiple awards and helped establish IU as a prominent figure in the Korean music industry, earning her the title of a national younger sister.