IU's third mini-album [REAL], which has established herself as a female solo artist who represents the music industry with her innate sensibility and singing ability, is co-produced by producer Cho Young-chul, who has presented trends in the music industry with successive hits such as 'Abracadabra', 'Nagging', and 'Irreversible', and producer Choi Gap-won, who has been working with IU for a long time and understands IU's musical sensibilities. , Lee Min-soo, Sinsa-dong Tiger, Kim Ea-na, Saint binary, Jeon Seung-woo, PJ, Min Woong-sik, and many of the top artists in the domestic music industry participated.
 
This new album is an album that reflects IU's unaffected, natural, and true appearance, just as the album title [REAL] meant.

'Good Day' is a song with a scale reminiscent of a musical. It is based on a magnificent yet dynamic sound centered on a cheerful melody, string arrangement and funky brass rhythm. The lyrics of 'Good Day' depict the heartache of a girl who likes 'oppa' but is shy and unable to confess easily. Through 'Good Day', IU will show off her explosive singing ability and performance depicting the shy cuteness of an 18-year-old girl, and will make the hearts of all 'oppas' across the country beat.

All the songs in this album are filled with high-quality songs that are comparable to the title feeling. First of all, composer Kim Hyung-seok's song 'It's not like this' is IU's first attempt at a Shibuya-type electronic medium song, and it stands out with a unique composition flowing throughout the song.

Kim Hyung-seok, who usually highly praised IU's emotional tone, brought IU's bright and sophisticated singing skills to life through this song. Yoon Jong-shin's work, 'The Night of the First Farewell,' is a song about a girl's day that is hectic and embarrassing after a breakup. After working on this song, Yoon Jong-shin praised IU as a coveted singer with both musical sensibility and intelligence.

'A Room Alone', with a sensuous arrangement and sophisticated melody, is a song by composer Jeon Seung-woo, and you can feel IU's deeper tone and sophisticated vocals. In particular, IU participated in writing the lyrics for 'A Room Alone' along with lyricist Choi Gap-won, imbuing the whole song with the emotions of an 18-year-old girl. The mournful ballad number 'Slow Things' is a collaboration between composer PJ and Min Woong-sik, and lyricist Choi Gap-won wrote the lyrics. It is an impressive song with a lyrical melody based on an acoustic sound that suits IU the most and beautiful lyrics that say that you will love a little more while slowing down the process of forgetting the person you loved after parting. Shinsadong Tiger's 'Merry Christmas in advance' is a confession song that IU presents to her fans. Since her trainee days, she has formed a friendship with M Black member Chun Doong, who participated in the rap to empower her. 'Merry Christmas in advance' was completed as a love song that will color everyone's hearts beautifully this winter with IU's clear voice and warm arrangement.