Marketed as his first "mini album" release, it consists of six songs, including the singles "Hate That..." and "Bad Love".

It peaked at number three on South Korea's Gaon Album Chart and received positive reviews from music critics.

[1] This was followed by two more releases in quick succession, Japanese EP Hologram (2018) and Face reissue I Wanna Be (2019), after which he took a hiatus due to his compulsory military enlistment.

[13][14] The final two songs on the EP, "Saturday Night" and "Eighteen (End of My World)", feature lyrics written by Key.

[13] "Eighteen (End of My World)" is a pop song with a warm, nostalgic atmosphere that Key described as a letter to his 18-year-old self.

'"[9] Promotional materials, including video and image teasers, were revealed via Shinee's social media accounts beginning September 13, showcasing a retro space theme.

[20] He also guested on various variety shows, including Comedy Big League, MMTG and Sixth Sense,[21][22][23] as well as performing on You Hee-yeol's Sketchbook.

Abby Webster of NME gave it five stars, writing that it "is at its best when it leans into the strangeness and vast possibility presented by its 20th century inspirations".

[9] Korean music critic Kim Yun-ha praised Key's vocal performance and his commitment to realising his creative vision.

She opined that although it built on existing trends in pop music, it incorporated its retro influences "in such an involving way" that it was able to stand on its own merits.