These are called "metropolitan cities," such as Seoul and Incheon. Big cities, like Seoul, are divided into districts called "gu." Inside the districts are neighborhoods called "dong." I live in Seongsu-dong (neighborhood), Seongdong-gu (district), inside Seoul (a city treated like a province). Seongsu has a population of just over 70,000 people.
I live in a Korean-style apartment with my parents. Most Korean apartments are in very tall buildings with lots of floors. Some buildings are as tall as 20 or 30 stories! Most buildings have elevators, and you don't usually need a key to get into your apartment. Instead, you type a number on a keypad or swipe a key card to unlock the door. Each apartment is like a small home inside the big building and typically has a living room, kitchen, bathroom (sometimes more than one), laundry area, and bedrooms.
A huge cultural difference is that in Korean homes, people always take off their shoes before going inside. There's a special space by the door where you leave your shoes and slip on indoor slippers. Many Korean apartments have heated floors. That means the floor gets warm in the winter, so you can sit or even lie on the floor and feel cozy. It's super nice!
Bathrooms are also a little different in Korean-style apartments. Instead of having a closed-off shower or bathtub (where the water can't escape onto the floor), bathrooms here are big, open wet rooms. So, you have to step down when you enter a bathroom because the floor is lower. This is to keep water from spilling out of the bathroom. In Korea, people are also very careful about sorting their trash. Each apartment building usually has a special area for trash, recycling, and food waste.
