My x2 visa was denied in Korea.

I came to Seoul, South Korea to apply for my x2 visa. I went through an agency and received my documents from them. When I applied at the visa center they took my documents and photo copied them and gave back the originals. They took my passport, the copies documents and my application. They have me my receipt for pick up. I went back 4 days later and they told me my visa application is denied. I asked why and they told me my admission letter and jw202 were fake. I was so shocked. The agency gave me fake documents and took my money.

My question is am I on some sort of blacklist in Korea from the Chinese embassy and can I reapply?

People are telling me I have to go back to my country to reapply others are saying if I get the correct and valid documents i can reapply. Other people also said try for a different visa. I’m just completely confused and I just want to get back to china as fast as possible.