Sorry to keep you wait .
Regarding the additional page, you can use the original certificate of Origin due to our side already contacted with Korean custom about new format AK form.
Seemly Korean custom can accept to apply new format base on Thailand so kindly re-check with your custom that can use this format or not?
If your side can accept, please kindly send us the original form and provide us DHL account no. in order to amend format.