That's none of your business. What you do is domestic trade, that is, you buy goods from the China branch of this Korean company. In this way, you can sign an agency agreement with their company, which embodies the double-headed customs declaration, that is, you are the receiving unit and his company is the operating unit. His Korean company is the seller and Japan is the supplier. You can pay foreign exchange. Take your contract, your agency agreement, your import tax bill and other documents and apply to the safe.