if ure having v line i advise u to stay in seoul post op for at least 10 days. For me personally i usually get so sick being cooped up in the hotel after 5 days but am unwilling to go wander about while im still swollen and recovering. So i always give myself at least 2 days past the final post op check up before i board my flight home. I think nothing beats recovering in your own home
Reason why i suggest having 2 days after your final post op check before leaving is so when they remove the cast or bandages, you can get a good idea of the results or god forbid if you are about to have an infection because the skin is red and full of puss. So get an open ticket and travel insurance too!
Also, what is your budget per night at a hotel? Ill give you an idea. If you get your clinic to book your accomodation for you out of the list of hotels they are affiliated with, the price reduction is usually 30-40%. For example, the imperial palace in gangnam is a 5 star hotel, usually costing around 300 USD a night. Clinics affiliated with that hotel are able to get the price reduced to 170 USD a night.