Hi Nimaee, You have to use std sales order process (as suggested by Jurgen L) for your business requirement.
As per std SAP process, SO will be received by China plant from end customer, and delivery plant should be Korea (who is actually shipping to end customer)
China plant/co code can bill to end customer in China currency "Yen" and customer can pay to china plant in "Yen" only.
for intercompany transactions, Koerian plant/company code will bill to China plant/company code separately.
Trust this is the std SAP process and used by many clients.