[1] Production of Invitation was handled by Kim Do-hoon, Lee Hyun-seung, Park Guen-tae, Duble Sidekick, Wheesung, and featured artists such as Verbal Jint, Swings and Simon D. Commercially, Invitation peaked at number ten on the Gaon Album Chart[2] and sold 10,555 copies by 2014.

On February 6, the music video teaser for Ailee's debut song, "Heaven", was released.

On February 9, Ailee released the song and the music video, which featured Beast's Lee Gi-kwang.

[5] On October 16, Ailee released her music video for her title track of the mini album, "I'll Show You", which featured MBLAQ's G.O.

On December 7, 2012, Ailee began follow up promotions with "Evening Sky" on Music Bank.