In what year was the album “Alone” released by 씨스타?

In what year was the album “Alone” released by 씨스타?: The album “Alone” was released in 2012 by 씨스타, featuring 7 tracks.
What is the most successful song from the album “Alone” by 씨스타?: “나혼자 Alone” is the biggest hit from the album “Alone” by 씨스타.

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