Dear Prahuschai,
Greetings from The Ritz-Carlton, Beijing.
For the visa issue, just like the initial email sent by Lassic said, the updated policy we know is that China government does not issue this kind of Invitation Letter to foreign interns for internship purpose.
Also no any work permit you mentioned below can be applied for our case.
That's why Lassic prepared our own invitation letter for food promotion purpose for your using
But we are still trying to look for potential agent who has the qualification to apply the official invitation letter issued by China government and will keep you posted as we get any progress.
Let's keep in touch and try best to achieve this internship
Regards,
Sammi Qiu
Asst. Director of Human Resources
The Ritz-Carlton, Beijing