Can you think of some disadvantages of being monolingual?

The downside of monolingual language is that it is never aware of the fun and inherent beauty of other languages. And it is complacent idea that even do not study English in a country where globalization has progressed this much.

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-사업차 왔습니다.

I 'm here to business. ---> I am here on business.

=> Corrected : The sentence is corrected grammatically.

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-여행하러 왔습니다.

I'm here to travel. ---I'm here on tour.

=> Your sentence has a correct grammatical structure, but this has the correct usage/ expression.

-친척을 방문하러 왔습니다.

I'm here to visit a relative. ---> I'm here to visit my relatives.

​=> Your sentence has a correct grammatical structure, but this has the correct usage/ expression.