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Seoul is the largest city and capital of South Korea. The city is the home of the Oh family, a family of influential members of the Ekaterina branch of the Cahill family. Their mansion, Oh Mansion, is located near the city.
The three-peaked mountain Pukhansan is located within the city limits of Seoul. Japanese emperor Toyotomi Hideyoshi, a member of the Tomas branch, hid a Clue, Gold, from his father Thomas Cahill in the mountain, along with sword confiscated from the Japanese population. During the Clue Hunt, three teams (One, Three, and Seven) visited Seoul and found the secret cave on the mountain that contained the Clue.
Seoul was chosen by Tomas leadership as the site of the 1988 Summer Olympics. This may have been a result of a hint pointing to the Clue hidden in Pukhansan, an operation involving the Oh family, or other Cahill activity. It is unknown if the Tomas are still active in the region.