Are Korean girls really that controlling?

All my Korean guy friends or other guy friends say not to date a Korean women as they are very controlling over who their bfs friends are, especially in terms of girl friends. One of my friends married a Korean girl, had to get rid of his best girl friend, has to go home by 5 30pm, etc.
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I do mean Korean girls who grew up in Korean. Obviously western Korean girls would be different.
Are Korean girls really that controlling?
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