The South Korean economy is dominated by a handful of Chaebols. One of these conglomerates is Samsung. The following chart shows the size and complexity of Samsung:

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Source: Why a horse named Vitana V might be good news for Korean equities, The Equities Forum, M&G Investments

Update (Aug, 2017):

Samsung Ownership Structure-2017

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Source: Summer of Samsung: A Corruption Scandal, a Political Firestorm—and a Record Profit, Bloomberg BusinessWeek

Also see:

• A Note on the Dividend Payments of South Korean Firms, TFS
• When Looking For Emerging Market Dividend Stocks Avoid Korea, TFS