The current, correct spelling is Busan:
Busan and Pusan are Italian equivalents of the English name "Pusan." The proper noun in question is the second major city in South Korea after the Republic's capital city of Seul ("Seoul").
Pusan :)
It's the same city. One is spelled the Western way (Pusan) and one is spelled the way it sounds in Korean (Busan).
Sapporo
A seaport port city in the southern tip of South Korea
The city with coordinates 43N and 79W is Toronto, Canada.
Seoul is the capital of South Korea and the second largest metropolitan area in the world. Pusan is the second largest city in South Korea.
The city with coordinates 53N and 113W is Edmonton, the capital city of the Canadian province of Alberta.
The city with coordinates 23N and 88E is Kolkata, India.
The coordinates 60N and 135W point to the city of Fairbanks in Alaska, USA.
There is no such thing as "a pusin". However, "Pusan" is a city located in the extreme southeast South Korea. In-case you have misspelled it, you possibly mean "a poussin". A poussin is a butcher's term for a young chicken, it is a word with French origins.
The Pusan Perimeter was not a person. (that is all i know sorry)