An K-ETA is required for all foreigners if you are entering the Republic of Korea for short-term staying(up to 90 days), tourism, or business visits. After the k-eta application process is completed and the result get by email, please print out the k-eta form and submit it to the airline check-in counter. Approved K-ETA is valid 2 years.
The QCODE is an application for travelers to the Republic of Korea to report their health status and their place of stay and contact information within Korea. This requirement applies to both Korean citizens and foreign nationals, and the application must be completed in three days before departing for Korea. It must also be applied every time enters Korea.
"Sharp Travel can quickly and accurately prepare these two documents for a small fee."