Seoul is known for its unique lifestyle as it is the city that never sleeps. No, literally, the city never sleeps. You have constant access to leisure, entertainment, and dining options from night markets to late-night spas and performances. Some people will go clubbing from 10 pm all the way to 6 am.
Seoul is also known for its unique cafe culture. Every street you walk down, you would probably come across at least 5 cafes. Each cafe also has a creative theme, from cat-themed cafes where you can pet and feed cats to robot cafes to floral-themed cafes with flower-themed desserts and drinks. There is a term we use here called "cafe-hopping." It's a popular activity you do with your friends. It's when you go to 2 - 5 cafes right after each other.
Seoul has a strong arts and culture scene. There are many festivals throughout the year. They also have a flourishing film and game industry that's reflected in some of their unique architectural and design landmarks like the DDP.
When you think of a city, do you think of mountains? No right. Seoul is unique in the way that mountains are integrated into the city. You can hop on the bus and get to a mountain within 30 minutes. Seoul is a city with many unique blends, such as the blend of nature and city, technology and tradition, and ancient architecture with modern architecture.
There are 10 million people living in Seoul so they need a way to get around. Seoul has really efficient and affordable public transportation. You can get on the subway or bus and get anywhere in the city. If you don't want to take either of those, that's okay; there are thousands of taxis available for you to take.