Don't look for an intermediary, they are all liars! I settled in Seoul. Many Koreans lived in South China, and many of them were cheated by the intermediary.
I was cheated so much that I couldn't get a normal visa at all. Don't really believe a liar! Even if you come, it's not easy to find a job. If you catch it, repatriate it, and your money will be wasted!
The liar will give you money when you land, but he will give you a business visa or a tourist visa, and then let you be black in Korea.
Life and death are your own business!
Don't trust the intermediary, don't trust those people on the internet, really, don't suffer!