Junior had their debut performance of "Mr. Simple" and a non-album track "Superman" at Music Bank on August 5, 2011, followed by Music Core the following day, Inkigayo after that and on August 11 on M! Countdown. However, promotions for the song ended on August 28 due to the enlistment of member Heechul to the army on September 1, 2011. The album was released in 11 countries across Asia., including Taiwan on September 6, 2011, by Avex Taiwan. The album was supposed to be pre-released in the Philippines by Universal Records on October 1, 2011, but was moved to October 8, citing manufacturing problems caused by typhoon Nesat. The Type A album was officially released in the country on November 24. After the released of "Mr Simple" in Japanese, the group followed-up with the release of "Opera" in Japanese. The single album also include the travel-themed mid-tempo ballad "Way", Japanese original music video and making-of DVD. It has been available for pre-order from March 11, 2012. Reception The album debuted at number 3 on Billboard World Albums Chart for the week of August 20, 2011. It peaked at number one on the Gaon Album Chart for the month of August, with 287,427 copies sold. Meanwhile, the repackaged album, A-Cha, which was released on September 19, debuted at number three with 97,210 copies sold. At the year-end list of album sales for 2011, compiled by Gaon Chart, the album is listed as the second best-selling album of the year with 343,348 copies sold and the repackaged version at number seven with 129,894 copies sold. Thus making a cumulative total sale of 473,242 copies in South Korea. On April 12, 2012, Gaon Chart reported that up till the end of March 2012, the album has sold a cumulative total of 502,830 copies, making it the first album in four years to exceed half a million in sales since Kim Gun Mo's eighth album He-story in 2003 and TVXQ's fourth album, Mirotic in 2008. The released in the Philippines on October 8, peaked at number one in Odyssey Weekly Album Chart. After a week of selling the album reached gold status with standout sales of 7,500. This was the group's 5th number one album and 4th album to certify gold status in the country making them the only Korean act to do so. Track listing Charts Release history Personnel Credits are for the