The agency, which last month launched an office in Düsseldorf, Germany, said the moves will build on its existing work with clients in the two regions, as well as expand its client base in Europe and Asia.
Jack Morton's exclusive affiliation with live marketing agency Mark Up, which works with the likes of Mars and Avon, will see the two companies work together to support existing and new clients throughout Brazil and South America.
The company told Event that the Seoul office will initially be staffed with a small team who will collaborate internally and externally with Jack Morton's sister agencies. It will be headed up by managing director Mike Kunheim.
Josh McCall, chief executive of Jack Morton Worldwide, said: "This is an exciting expansion for us.
"We have been working extensively in Germany and South Korea for years and have been breaking into the Brazil market recently, but to now have support on the ground provides a smoother experience for clients and gives us a great springboard to be ambitious about the experiences we create as well as our global growth as an agency."
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