In 2017, the heir to South Korea’s biggest company is facing jail, leaving it with an uncertain future. After 80 years of business, how did Samsung get here? And how did a deal meant to secure family control of the company go so wrong? We take you behind closed doors inside the billion-dollar deals and the family power struggles that shape global empires. When your relatives are also your business partners, every decision is personal. In these dynasties, the boardroom is not just about profit - it is about survival. A new 10-part series from the BBC World Service.