This is the 1017th most frequent Korean word.
서울시
"서울시" means "Seoul City," referring to the capital city of South Korea.
In this sentence, '서울시' is used to refer to the city of Seoul in its official capacity as a city entity.
서울시는 대한민국의 수도입니다.
Seoul is the capital city of South Korea.
Here, '서울시' is used to denote Seoul as the location where events occur.
서울시에서는 다양한 문화 행사가 열립니다.
Various cultural events are held in Seoul.
In this sentence, '서울시' is used as a destination and implies a geographical area where the city is located.