On May 22, 2008, Shinee released their first EP under SM Entertainment which contains five tracks, including a remix version of their title song.

[10] Also, Shinee's fashion style, which was created by designer Ha Sang-beg and features high-top sneakers, skinny jeans, and colorful sweaters, gained a lot of attention.

[14] On June 22, 2011, Shinee debuted in Japan and released the Japanese version of "Replay",[15] selling more than 91,000 copies in the first week.

[17] Shinee were introduced as a contemporary R&B boy group[18] and debuted with a mini-album which includes a variety of genres mixed to create a total of five diverse R&B songs.

Songwriters Yoo Young-jin and Kenzie participated in the composition of the album to create a "sophisticated sound with a wide range of vocals".