C hang Pyung-soon is a South Korean self-made billionaire and the founder of Kyowon Group, one of the country's largest education and life care companies. He started his career in sales before founding his own company in 1985 with a small amount of capital. He identified a significant market for educational materials and private tutoring in South Korea's highly competitive academic environment.

Kyowon's primary business is publishing educational books and magazines for children, which are sold directly to households through a large network of sales agents and tutors. The company is particularly famous for its Kumon workbooks. Chang has since diversified the business into a 'life care' company, with interests in water purifiers, cosmetics, and hotels. Despite the company's large scale, he has kept it privately owned and is known for his hands-on management style.