Rain's World is the 4th studio album by South Korean pop and R&B singer Rain. Two years after his last album, Rain finally came back with his fourth album. Building on the success of its predecessor, the album further established him as one of the top musical acts in Southeast Asia.

Two years after his last album, Rain finally comes back with his fourth album. By January 2007, the album sold 158,179 in South Korea and 1.000.000 + All Asia

The success of the album lead to a repackage album with a new album art as well as two versions: A type (CD+DVD Set) and B Type (CD+DVD+Diary Set). CD contains remixed 'Bad Guy', 'I'm Coming', 'I' And 'With U' added to films of 4th album recording, jacket picture shooting session, a music video taping. B Type re-pack, which was limited to 5,000 copies, was a seasonal item for the Fall of the year with a high quality diary that has Rain's pictures undisclosed to the public.

To promote the release, Rain went on a world tour. The tour started in Seoul and included stops in the US, Japan, China, Singapore, and more, for a total of 35 concerts in 12 countries. What stands out in particular was his concert in Las Vegas, which was another first for a Korean artist.

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