Document submission to KIPO is possible either by fax or by mail.
Facsimile number is 82-42-481-8578. You need to press 011 if dialing from the United States.
Mailing address is as follows:
International Application Division Korean Intellectual Property Office Government Complex-Daejeon, 189 Cheongsa-ro, Seo-gu, Daejeon 35208 Republic of Korea
Please bear in mind that it can take about a week for mail delivery. Your mail should arrive at KIPO within the due date.
In short, you are not obliged to select KIPO as the IPEA even if you already designated KIPO as the ISA. ISA selection and IPEA selection are separate.
Currently there are 7 different IPEA's available to the US PCT applicants, that is, IP Australia, EPO, IPAU, JPO, KIPO, Rospatent, and USPTO.
But EPO is available as the IPEA only when the international search is or has been performed by the EPO, the Austrian Patent Office, the National Board of Patents and Registration of Finland, the Nordic Patent Institute, the Spanish Patent and Trademark Office or the Swedish Patent and Registration Office. IP Australia has a similar approach. Thus you have two choices. Either KIPO or USPTO as the IPEA if you used the ISA/KR.
Submission via email is not available for filing to KIPO.
There are two possible filing methods - either by fax or by mail.
KIPO’s Fax no. : 82-42-481-8578.
Mailing address: International Application Division
Korean Intellectual Property Office
189 Cheongsa-ro, Seo-gu, Daejeon 35208
Republic of Korea
If you wish to schedule an interview you may request an interview with KIPO via their email : email@example.com or via fax :82-42-481-8578.
With the time difference, a telephone interview will be hard to schedule.
Also, in the case you receive a IPEA-WO from KIPO/IPEA during the Demand process you may directly contact the IPEA examiner mentioned on your WO via email.
If you don't know the email address of your examiner, then you may contact KIPO's email (firstname.lastname@example.org) for your examiner's email.