Stories by Five Samsung executives, including the company's 48-year-old billionaire heir, will stand trial in the coming months on bribery, embezzlement and other charges linked to a massive scandal that toppled South Korea's president.

Before being arrested earlier this month, Lee Jae-yong, the third generation of the Samsung founding family, was seen as bringing a string of changes to South Korea's largest business group, such as increasing shareholder returns. The criminal...