In what year was the album “SS501 S.T 01 NOW” released by SS501?

In what year was the album “SS501 S.T 01 NOW” released by SS501?: The album “SS501 S.T 01 NOW” was released in 2006 by SS501, featuring 10 tracks.
What is the most successful song from the album “SS501 S.T 01 NOW” by SS501?: “Existence” is the biggest hit from the album “SS501 S.T 01 NOW” by SS501.

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