After wrapping up the initial promotion for her home group's fourth studio album Sixth Sense (2011), it was reported that Gain would sign a contract with LOEN Entertainment for her future solo career and acting endeavors.

The extended play opens with "Tinkerbell" (Korean: 팅커벨; RR: Tingkeobel), described as an IDM-pop track with "damaged, half-deleted" Latin guitar while running through synthesized wobbly low-frequency oscillation chords with many "violent jump cuts", blowing riffs and a four-bar break.

The song features the vocal from its co-composer Yoon, who would later become Gain's fellow labelmate following her movement to Mystic's subsidiary label APOP in July 2014.

To promote the extended play, Gain made her first comeback stage on Music Bank (KBS) on October 5, 2012, the album's release date, followed by performances on Show!

Jakob Dorof from Pitchfork Media called the extended play "excellent", further praising Gain for using her solo career "to test the limits of both Korea's mainstream music and morals".

[4] Writer Hwang Sun-eob from IZM also praised the release, citing it as a "fair" showcase of Gain's musical flexibility, further growing away from the comparison to singer-songwriter IU.

[7] The extended play eventually finished as the ninth best-selling release of October 2012 on the monthly Gaon Album Chart issue, having sold a total of 9,855 copies.