"[5][6] Hanhae was a trainee under Stardom Entertainment and an original member of k-pop group Block B.

[9] As Phantom, they released several videos that year on YouTube, including "19 Song," a medley of songs that had been banned by the South Korean Ministry of Gender Equality and Family,[10] and "Freddie 'Phantom' Mercury Singing The Boys", which featured Sanchez emulating Queen's lead singer Freddie Mercury while singing the song "The Boys" by girl group Girls' Generation.

[11] On 25 November 2011, Phantom released their first single album, Hole In Your Face (얼굴 뚫어지겠다).

[13] The video, which depicted a girl being shot in the head by a gun, was immediately controversial due to its graphic nature, and the group released a censored version soon after.

[15] However, they made many performances over the next few months, appearing alongside popular artists including Verbal Jint, Bizniz, Swings, and Mighty Mouth.

[25] Phantom made their music show debut with the album track, "Burning", which they performed on M!