Amazon QuickSight is now available in the Asia Pacific (Seoul) region. New users can sign up for QuickSight with Asia Pacific (Seoul) as their home region, making SPICE capacity available in-region and providing proximity to AWS and on-premises data sources. Existing Amazon QuickSight users can switch to this region via the region switcher in the User Interface to provision SPICE capacity, and enable faster and cheaper connectivity to data sources in that region.

from Recent Announcements https://aws.amazon.com/about-aws/whats-new/2019/10/amazon-quicksight-supports-seoul-region-dashboard-printing-and-more/