Kim Byung Hoon, founder of APR, has joined South Korea’s billionaire ranks with his US$1.3 billion stake in the beauty tech firm, which is soaring thanks to its TikTok popularity.Kim Byung Hoon, founder of APR, has joined South Korea’s billionaire ranks with his US$1.3 billion stake in the beauty tech firm, which is soaring thanks to its TikTok popularity. VnExpress English