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In February 2012, they came back with their new style of music through Touch.
They promoted the song for a month and had their last goodbye stage on November 7.The group then returned in July 2011 with the release of their first full-length studio album A Class with the title track "Good Bye Baby".The song was written by Korean composer Super Changddai, and the music video was directed by Hong Won-ki.After a successful promotion period of seven weeks, the group came back in October with a new title track, "Breathe", from the second single Step Up.
The trio began their first official promotional activities in China as a group by signing up with the Samsung Electronics group in China.
The group released a song used for the commercial called "Love Again" for the Samsung Beat Festival.