Official sales will begin the following week on November 3.
With the pricier higher-spec iPhone X's launch date up in the air, SK Telecom, KT, and LG Uplus are keen to promote the iPhone 8 series.
However, there are some worries whether the phones will be popular due to consumers waiting for the iPhone X, a telco official said.
Offloading remaining stocks of the iPhone 7 concurrently will also be a priority, the official added.
Prices are yet to be announced, but the iPhone 8 Plus is expected to be the most costly ever for a flagship in the country.
Launched in the US on September 22, the iPhone 8 has so far reported less in initial sales than its predecessors.
Its main competitor, Samsung's Galaxy Note 8, has sold an average of 15,000 units a day in South Korea since sales began on September 21. It is widely expected to sell more than 10 million units before the year's end.
PREVIOUS AND RELATED COVERAGE
Should you spend the extra bucks on an X, or is an iPhone 8 or 8 Plus good enough? Here's how to decide.
OLED panel problems and technical issues relating to Face ID components could mean severe shortages well into next year.
Apple delivers two phones that are incremental upgrades and one that aims to set the stage for the next decade. Enter iPhone X.