Lotteria Gupo is a fast-food restaurant in front of Gupo Station in Busan, where the KTX train station and Busan Subway Line 3 meet. T-Rex Burger and Ria Miracle Burger can be ordered as single items for takeout, and food is cooked to order. Seating extends to the second floor and is spacious, so you can wait there for a train or bus. Food comes out slowly, so allow extra time for takeout before your train.