Yeongusaeng
A Yeongusaeng (lit. "research student") is a student studying at the (korean go institute?) to become a professional player.
The Japanese equivalent is called Insei, the Chinese student is called Yuansheng (院生 yuànshēng or yuan4 sheng1).
Some photos from a Korean Go School (one of the largest ones):
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http://badyk.ru/files/P6050013.jpg/
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http://badyk.ru/files/P6050012.jpg/
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http://badyk.ru/files/P6050010.jpg/
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http://badyk.ru/files/P6050007.jpg/
The main teacher of this school Mr. Yoo Jongsu?, 7-dan is quite famous in Europe