<ul data-eligibleForWebStory="false">Korean beauty mogul Kim Byung Hoon, 36, becomes a billionaire with APR skyrocketing.APR, a Seoul-based startup, gained fame with high-tech facial devices and K-beauty.Kim's hands-on approach led APR to $1.3 billion success, expanding globally.APR's leading Medicube brand gains popularity in the US, eyeing further expansion.