General Recommendations

Grab a business card 🪪 from the hotel 🏨 you are staying in, and carry it with you when going outside. In an emergency situation 🆘 and need to go back, you can show the hotel address to a taxi driver.
You WILL walk a lot, so bring (or buy/get) comfortable shoes 👟
WATER 💧 is basically free. Mostly in restaurants or water dispensers 🚰 inside buildings (also in the airport).
There are many public bathrooms 🚽
Many Korean know English 🇬🇧, specially the younger ones, but they get a bit nervous of using it at first.
There are many places with Free Wi-Fi 📶. The main ones are coffee shops ☕.
Don’t talk loudly in public transport

Weather

South Korea has four seasons. Beware in what season are you coming ☀️🌧️☃️. The weather forecast matter, A LOT, specially Air Quality, Precipitation, and UV Index. Check it here 👉 https://gsacarelo.github.io/community/apps/weather/index.html
High levels of: Air Quality Index → MASK 😷, Precipitation → UMBRELLA☔, UV Index → SUNSCREEN🧴
Some friends have a mild allergic reaction to the water when they take a shower. Bring or buy skin lotion if you need it.

The jetlag can be mitigate faster if you drink a cup of coffee to match the local time

These tips are not absolute. They come from my personal experience. Any recommendation please contact me 💌