The band served to promote stuffed toys and various other products from the store.

[2] The duo was officially announced via the opening of their MySpace account in October 2008.

Their first mini-album, Kill Me Kiss Me, was released simultaneously in Japan and South Korea on 19 November 2008.

[3] As of 2009, the duo became known as Hangry & Angry-f, the "f" referring their new future style of white costumes.

In April 2009, they made their overseas debut at Sakura-Con in Seattle, Washington.