6) Kim Beom-su (Net worth: $2.9 billion)
Kim Beom-su grew up in poverty. He sometimes skipped meals to save money. Today he is the chairman of Daum Kakao Corp. This 40-year-old self-made billionaire became rich with KakaoTalk, a multi-platform texting app that allows Android, iPhone and BlackBerry users to send and receive messages for free. Daum Kakao Corp is currently valued at approximately $9.5 billion. Kim owns around 40 percent of the company.
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