Whether you need to recheck your bags when connecting through South Korea (typically at Incheon International Airport - ICN) depends on how your tickets were booked. If you are on a "Through-Ticket" (one booking reference/PNR) and your bags were tagged to your final destination at your original departure point, you generally do not need to recheck them. You will simply follow the "Transfer" signs to your next gate. Incheon is world-renowned for its efficient transit system, and your luggage will be automatically transferred between planes. However, if you are "Self-Transferring"—meaning you booked two separate tickets on different airlines that do not have an interline agreement—you must clear immigration, collect your bags from the carousel, pass through customs, and then go up to the departures level to check them in again for your second flight. Additionally, if your layover is longer than 24 hours, some airlines may require you to collect your bags regardless. It is always best to confirm with the check-in agent at your very first airport; if your bag tag shows the final airport code, you are likely set for a hands-free connection in Korea.