The group released a Japanese version of the song as their second single in Japan on June 15, 2011.
Each edition of the single has a different B-side, all of which are remixes of their Korean songs aside from Easy (Sincere Version).
[4] On June 14, 2011, Beast held a surprise event at Tokyo, Shinjuku Station Square where they performed “Bad Girl (Japanese version)” and their debut single “Shock (Japanese Version) in front of approximately 5,000 fans.
However, Beast leader Yoon Doo Joon was not present in the event due to conflicting schedules.
[5] The group also held a two-day mini-concert titled Beast Night on June 22, 2011 at Studio Coast in Tokyo as a celebration for the release of their single.