Formed in 2011 by The Entertainment Pascal,[fn 1] the group attracted attention as they were initially produced by Eric Mun of the boy band Shinhwa.

[1] Following an unsuccessful debut with the single "Rocket Girl" in August 2011, Stellar underwent a line-up change and released "UFO" in February 2012, which fared similarly.

[3][fn 2][4] Stellar gained notoriety in February 2014, when they adopted a more "provocative" image for the release of their first extended play Marionette.

The album's title track peaked at number thirty-five on the Gaon Digital Chart, making it their most commercially successful single.

[8][9] Gayoung had gained attention for her appearance on the Viewers' Tour episode of 1 Night 2 Days and had been cast in the drama series Poseidon alongside Top Class Entertainment operator and Shinhwa member Eric Mun.

The series was set to air on the SBS network until production halted following the November 2010 Yeonpyeong bombardment incident.

The final debut line-up of Stellar was Gayoung, true rookie Jeon-yul, and ex-Honeydew members Lee-seul and JoA.

On January 26, 2012, it was announced that Lee-seul and JoA were leaving the group and would be replaced by Min-hee and Hyo-eun for their first comeback track "UFO".

[15] The group received criticism for their "stripping game" promotion, which involved fans having to "like" posts on Stellar's official Facebook page to reveal photos of the members' body parts.

The video – created by virtual reality company Moovr – allows viewers to use their computer mouse or move their smartphone to scroll around a 360-degree rotating view of the stage as the four members perform.

The band explained that their intentions for "Sting" were different from "Marionette" and "Vibrato", stating "This time, we wanted to look more like a girlfriend rather than to [...] look provocative.

[33] On March 26, 2017, Stellar was the first Korean girl group to hold a solo concert in Brazil, playing for a sold-out crowd of almost 1,000 people.

This theme was confirmed by both the tags used for the teaser images on social media and in a radio interview starring Stellar.

[49] On October 30, 2018, Minhee released a video of Stellar's first reunion party after disbandment[50] through her YouTube channel "About Mini".