Answer by taking a quote from the following article:

Rain was born as Jung Ji-hoon on June 25, 1982, in Seosan, South Chungcheong Province in South Korea. His mother died in December 2000 as she struggled with diabetes. In the same year, Rain was recruited as a trainee for JYP Entertainment, led by recording artist and producer Park Jin-young. In a CNN interview and also in a Discovery Channel documentary called Discovering Hip Korea, he recalled being repeatedly rejected because of his looks: "In fact, I was told after one audition that my singing and dancing was great

Rain is considered a 'world star' due to his popularity, not only in South Korea and Japan, but throughout Asia, Europe and North America with fans in countries like China, Singapore, Thailand, Canada and United States. Much of his popularity is attributed to his various acting roles (varying from television like Full House to indie films like I'm a Cyborg, But That's OK to blockbusters like Ninja Assassin). Before landing his role in Speed Racer, he had expressed the desire to expand beyond the Asian market when he stated in an interview, "The reason I am active in Japan, Hong Kong, China and around Asia is that I want to succeed here and then go even more international...I would really like to see, is a top Asian artist emerge strongly from the Asian market, and then go on to succeed in the U.S. market."  Rain's appeal to all demographics has made him one of Korea's highest paid celebrities by endorsers with an asking price of $1 - 1.5 million USD per endorsement. Over the years, he endorsed brands such as Hyundai, Lotte, KB Card, Pizza Hut, Thailand dairy company Dutch Mill, Chinese pastry Fu Mu Cakes, Pantech, LG Electronics, SK Telecom and Pepsi. Rain has even done songs to tie-in with endorsement deals. "Still Believe" was used as both an ad and a music video for BMW Korea's "Meet the Truth" campaign with appearances by Rain as well as JYP. "Memory in My Hand" and "Any Dream" were used in campaigns for Pantech and Samsung, respectively, in China.  With his booming popularity throughout the world, he has been deemed a "cultural ambassador" as he has represented South Korea in inter-Asian musical events and has appeared in a Thai published textbook.

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Rain's appeal to all demographics has made him one of Korea's highest paid celebrities by endorsers with an asking price of $1 - 1.5 million