Busan is South Korea's second largest metropolis after Seoul, with a population of around 3.6 million. It is the largest port city in South Korea and the fifth largest port in the world. The city is located on the southeasternmost tip of the Korean peninsula and faces the Korea Strait. The most densely built up areas of the city are situated in a number of narrow valleys between the Nakdong River and Suyeong River, with mountains separating some of the districts. Nampodong to the south is Busan's shopping and entertainment downtown, while central Seomyeon at the intersection of subway lines 1 and 2 is the main office building area. Between them are Busan's train station and its international ferry terminals. The beaches of Gwangalli, Haeundae and Songjeong lie to the east, the ruins of mountain fortress Geumjeong guard the north. To the west is Gimhae town where the Busan Airport is located.

Tokyo - officially Tokyo Metropolis, is one of the 47 prefectures of Japan. It is located on the eastern side of the main island Honshū and includes the Izu Islands and Ogasawara Islands. It is the capital of Japan, the center of the Greater Tokyo Area, and the largest metropolitan area of Japan. It is the seat of the Japanese government and the Imperial Palace, and the home of the Japanese Imperial Family. The city is famed for its vibrant food scene, and its Shibuya and Harajuku districts are the heart of its trendy teen fashion scene.

Osaka is a designated city in the Kansai region of Japan. Located at the mouth of the Yodo River on Osaka Bay, it is known for its modern architecture, rip-roaring nightlife and delectable street food. Historically a merchant city, Osaka is traditionally considered the "nation's kitchen" (天下の台所 tenka no daidokoro) or the gourmet food capital of Japan that served as a center for the rice trade during the Edo period. The city has a long history and is home to many ancient shrines and temples, and to the famous Osaka Castle, built by Toyotomi Hideyoshi in the late sixteenth century.