Currently (on1 August, 2019), the Demand fee for KIPO is KRW 676,000 which is made up of the Preliminary Examination Fee (KRW 450,000) and Handling Fee (KRW 226,000). Applicants are required to pay the fees voluntarily direct to the KIPO as IPEA within the time limit.
In the future, you may visit, and check the “ PCT Fees Tables ” at https://www.wipo.int/export/sites/www/pct/en/fees.pdf to find the current fee as fees tend to fluctuate. Table II of the PDF will show you the current Demand fees.