Here is the relevant part: "Much of South Korea’s economy, Asia’s fourth largest, would falter without these workers and 200,000 migrants from poorer countries, like Vietnam, Myanmar, Sri Lanka and Uzbekistan.
Because they understand the language and culture, ethnic Koreans from China are particularly favored. They find jobs as live-in housemaids and toil at farms and factories. But their distinctive accent, similar to that of North Koreans, betrays their origin.
South Koreans often call them “dongpo,” which means compatriots, or literally “people from the same womb.” But they do not always welcome them. Labor unions complain that they take jobs from Koreans and drive down wages. The government tightly controls how many are admitted each year on temporary work visas."
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