"Good Day" () is a song recorded in two languages (Korean and Japanese) by South Korean singer IU. The Korean version was released on December 9, 2010, as the lead single for IU's third extended play (EP) Real. It was written by Kim Eana, while production was handled by Lee Min-soo. The Japanese version was originally included on IU's first Japanese extended play I□U, released on December 14, 2011, before being released on March 21, 2012, as IU's first single album Good Day.
"Good Day" received generally positive reviews by music critics. Billboard magazine crowned it as the best K-pop song released in the 2010s. Commercially, the song debuted atop the Gaon Digital Chart, topping the chart for five weeks and becoming the sixth best-selling single in South Korea, selling more than 4.4 million digital units. The Japanese version reached the top five on the Oricon Singles Chart, and sold more than 30,000 physical copies in the country.
Background and release "Good Day" was released on December 9, 2010, simultaneously with the singer's third extended play (EP) Real. On November 15, 2011, Loen announced, that IU was signed to EMI Music Japan and was set to release an extended play with her greatest hits recorded in Japanese, on December 14, 2011, titled I□U. Music and lyrics
The Korean version of "Good Day" was written by Kim Eana, while production was handled by Lee Min-soo. In terms of musical notation, the song is composed in the key of A♭ major, with a tempo of 128 beats per minute, and runs for 3 minutes and 53 seconds.
Reception Writing for New Straits Times, Bibi Nurshuhada Ramli described "Good Day" as IU's breakout song. South China Morning Posts Sylvia Issa described the songs as a "unique musical phenomenon". In November 2019, Billboard magazine compiled a list of the 100 Greatest K-Pop Songs of the 2010s, with the single "Good Day" ranking at number one.
Commercially, "Good Day" debuted at number one of the South Korean singles chart on the 51st issued week of 2010. It topped the chart for five consecutive weeks, falling to no. four on the fourth issued week in 2011. The song held the record for the most weeks at number one until 2018, when it was beaten by iKon "Love Scenario". Furthermore, the single topped the monthly singles chart in December 2010. It was selected as Gallup Korea's Song of the Year in 2011.
+"Good Day" on critic listsPublicationListRank Billboard 100 Greatest K-pop Songs of the 2010s: Staff List 1 Gallup Korea 10 Most Beloved K-pop Songs of the 21st Century 4 Melon Top 100 K-pop Songs of All Time 15 Rolling Stone 100 Greatest Songs in the History of Korean Pop Music 3 Star News 10 Best Digital Hit Songs in the Past 10 Years No order
Accolades +Awards and nominations Year Organization Award Result 2011 Cyworld Digital Music Awards Song of the Month – December Melon Music Awards Netizen Popular Song Song of the Year Mnet Asian Music Awards Best Vocal Performance – Solo Song of the Year Seoul Music Awards Best Song Award 2012 Korean Music Awards Song of the Year Best Korean Pop Song
+Music program awards Program Date Inkigayo December 19, 2010 December 26, 2010 January 2, 2011 M Countdown December 23, 2010 Music Bank December 24, 2010 December 31, 2010 January 7, 2011
Track listing
Chart performance
Weekly charts Chart (2010–12) Peakposition Japan (Japan Hot 100) 5 Japan (Oricon) 6 South Korea (Gaon Digital Chart) 1
Year-end charts Chart (2011) Position South Korea (Gaon) 17
Sales Country Sales amount South Korea 4,450,508Cumulative sales for "Good Day":
Japan (physical) 30,634
Release history Region Date Version Format Label Various December 9, 2010 Korean Digital download Kakao M Japan March 21, 2012 Japanese CD, Digital download EMI Music Japan
References