In what year was the album “First Single” released by BIGBANG?

In what year was the album “First Single” released by BIGBANG?: The album “First Single” was released in 2006 by BIGBANG, featuring 2 tracks.
What is the most successful song from the album “First Single” by BIGBANG?: “We Belong Together (feat. Park Bom)” is the biggest hit from the album “First Single” by BIGBANG.

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