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There is a difference between consultation appointments and surgery day.

Scheduling a consultation ahead of time is always best, but nowadays you can getaway with just being a walk-in (due to COVID), but some clinics may end up telling you to come back the following or day after tomorrow if they need to prepare an interpreter or if their English coordinator has the day off. These days some English staff members are only working part-time.
Deposits are only necessary if you have already decided and know you want surgery with that clinic and a particular doctor and want to lock down the schedule. 

Hi Mich,

The most popular season is winter. It's just generally comfortable to go around that time because the weather is colder.
Why is Winter Popular
Cold wind & air can help recovery Wearing winter clothes & masks feels normal & comfortable It also feels emotionally fine to stay indoors & hibernate as opposed to being cooped on a lovely day. Most people have also saved time their vacation time around this season and will maximize winter holidays & new year If you want to avoid peak times, but still have pleasant weather then Spring & Fall months.
By the way, here is an amazing thread by @JLBCGP 
 
 

Airbnb is a common alternative to hotels, but here are some Airbnb selection tips:
Try to pick ones near the clinic area (Gangnam Station, Yeoksam Station, Non-hyeon Station, Sinsa Station). Picking places around here will generally put you in 8 to 15 commute from most clinics located in the Gangnam area (depends on traffic) Try to pick places that have an elevator or are only 2 or 3 floors max stair walk if there is no elevator. If you stay in a hotel or airbnb make sure you prepare it for your recovery. Move things that you might trip on, cover up sharp corners, buy plastic covers if you think you may leak from your wound site, make sure you get plenty of pillows, so you can sleep on a 45 degree angle. You could also try a homestay with a Korean family, and let them know if you are coming for surgery.
Note of Caution About Hosts
Be cautious when telling a host you are coming for surgery. Although we'd like to believe in the kindness of strangers, if they suddenly become invested in your surgery details and volunteering their time to assist you, then they may actually be brokering your surgery without your knowledge.
You should not disclose the names of the clinic you plan to visit until you have confirmed your final prices face to face, and have decided upon which clinic will do the surgery. If they ask clinic details before that time, then give them a random clinic name that you don't actually plan to visit. You can tell them the real clinic name after everything has been confirmed and decided upon,  since it may be relevant for them to know for emergency contact purposes after your surgery. 
Some red flags that a host may be acting as a covert broker is if they start volunteering services that are essentially done by medical tour agencies such as planing and arranging your clinic schedule, soliciting clinic recommendations, handling your personal information with clinics, escorting you to the clinic and interpreting for you. If you want all these things then you should just simply work with an actual medical tour agency from the get go, since they'll be upfront about these services and what their role and responsibilities are.

Any Korean resident or non-resident who carries in less than USD10,000 into Korea doesn't need to declare it with the customs.
If the amount exceeds USD10,000, you are required to declare it when entering Korea. But no customs duties, taxes or fees will be imposed.
Customs officials may request to see the entire money for verification.
Let's say you brought in $18,000 USD, declared it, but you only spend $4,000 in Korea. If you carry out USD14,000 after bringing in USD18,000, you don't have to get approval from or declare with the Bank of Korea. (under the Foreign Exchange Transactions Regulation Article 6-2)
What happens if I am bringing in more than $10,000 USD and I don't declare it to just skip the paperwork and fuss. 
You may be subject to less than 1 year of imprisonment or less than 100 million won of fine under the provisions of Article 28 of the Foreign Exchange Transactions Act of Korea.
Source: Korea Customs

I recommend using Uber Eats.
You can have it delivered right to your hotel. The tricky part is inputting the address correctly into the app. If you are staying in a hotel ask the lobby staff do it for you. 
Make sure you know the correct English form for inputting your address, usually the app will auto correct it for you.
 
 
 
 
 
 

It would be easier to do a homestay or stay at an airbnb ran by some caring hosts or Korean parents who have empty nest syndrome since there kids moved away.
A word of advice for doing airbnb or homestay is to not mention a clinic's name before your surgery, and if a host is insistent about taking you to the clinic themselves for consultation that's not a good sign. Sometimes they can be doing something know as secret referrals and trying to get a cut of your fees. 
There are really nice places out there though. I will try to dig up some worth exploring, but I am not endorsing them. 
 
 

"Baspo Ointment" 바스포연고 (Top Tube: small white and orange color tube with green cross )
Topical antibiotic ointment to treat various infectious diseases caused by bacteria.
Manufacturer: Green Cross Ingredients: Bacitracin 400IU/g  Polymyxin B Sulfate 5000IU/g Neomycin Sulfate 3.5mg/g "Scar Derm Gel" 스카덤겔 (Bottom Tube: large white and red color)
Topical ointment to prevent scaring.
Manufacturer: Sin Sin Pharm Ingredients: Heparin Sodium 50 IU/g, 100 mg/g Allantoin 10 mg/g

Yes, this is a common universal travel adapter, and will usually get you by just fine. They cost between $3 to $10 and you can pick it up at most airport travel shops or get one at your nearby electronics shop.

Know your volts
Be sure to know what your voltage is in your home country. Just google: "Power voltage _______ (country)"
But Korea's power voltage is 220 Volts (the strength of the electrical current) in the USA it is 120 V. Most devices like laptops and mobile phones will automatically adjust, but other appliances like hair dryers and blenders won't, so don't bring those to Korea. You could damage them, shock your self, or blow a fuse and knock out the electricity.

The bus you want to take is number 6009. If you are catching it from Gangnam Station the operating hours are 03:46 AM ~ 08:40 PM. The bus arrives in 15 to 20 minute intervals.  
The bus stop is in the middle of the street away from Exits 10 & 11 of Gangnam Station.
The
 

 

GNG Hospital is very close to The Korea City Air Terminal also known as CALT. This is right next to the Seven Luck Casino, behind the COEX Complex (Convention center and shopping mall).
CALT WEBSITE
What is a city terminal? It's a city terminal that allows you check-in into your flight, check-your luggage, and board an airport bus that goes direct to the Incheon International airport. You will then just need to pass through security, and that's it.
Participating Airlines that allow you to check-in at City Airport: Korean Air, Asiana Airlines, Jeju Air, Qatar Airways, Singapore Airlines, Thai Airways, Air Canada, China Eastern Airlines, Shanghai Airlines, China Southern Airlines, KLM Royal Dutch Airlines, Delta Airlines, United Airlines, Air France, Eastar Jet, Jin Air
If your airline is not listed, no problem you can still just take the airport bus:
Bus Operating Hours from City Terminal
City Airport → Incheon Airport : 04:15 - 21:30 Intervals : 10 - 25 minutes Gangnam district, Seoul, is one of South Korea's Airport terminals. It is part of the COEX complex.
 

Taxi drivers will usually understand you're a foreigner and lower the expectation for you to speak Korean.
If you want to speak Korean for practice or to be polite then you can try to say this simple script:
Anh yeong ha say yo - 안영하세요  - Hello Yo Gee - 여기  -  Here (show driver the address) Ka ju say yo - 가 주세요  - Can you take me please? Also in Korea, it's best to show a Korean taxi driver the address in the Korean language. 
PRO TIP:
1) Driver's like big font and text. If you can some copy and paste text into a app to increase font size or screen shot and zoom, it makes things easy.
강남구 대치동 998 (instead of small font like this: 강남구 대치동 998)
강남구 대치동  998 =  District - Neighborhood - Land Lot Number
2) If you have the English address and want the Korean version use this website:
998, Daechi-dong, Gangnam-gu, Seoul (English version of above address)
http://www.juso.go.kr/openEngPage.do
3) There are two ways to express an address in Korean
If you see another version of your address it is not incorrect, it could be one of two versions.
Example: 강남구 대치동 998 and 강남구 테헤란로114길 11 are the same place
In English: 998, Daechi-dong, Gangnam-gu, Seoul and 11, Teheran-ro 114-gil, Gangnam-gu, Seoul
Land Lot Version (Old way, but taxi drivers are used to it) 998, Daechi-dong, Gangnam-gu, Seoul  강남구 대치동 998 Street Address Version (New way) 11, Teheran-ro 114-gil, Gangnam-gu, Seoul 강남구 테헤란로114길 11