I will have a long layover on Incheon. I want to visit Seoul during this layover, but according the official website I need a K-ETA and I need to write the address where I'll be staying.
Q17: Transfer/transit passengers who are not entering Korea do not need to get a K-ETA.
Q40: please enter the address of main location where you will be staying during the visit. If the address is changed after you obtained the K-ETA approval, please update it at the K-ETA website [K-ETA Application Results]-[Edit Information]. Please be advised that there may be disadvantages if you do not update your address.
Since my visit will be a short one, I will not get a hotel room. What should I put as the address in this case?