The content you sent me is so difficult that I really don't know what it is.
Even China people can't explain it.
Write more easily next time.
It's a reply from a Korean friend. It seems that it is too difficult for you to answer his letter. I think it's not that we in China can't explain it, but that we don't know how to explain it to your Korean friends in Korean. If he doesn't understand, let him post it online and I'll help him translate it. Ha ha.