Yellow Trunk is a handmade burger shop across from COEX in Samseong-dong, serving classic, double classic, and cheeseburgers. Fries, sweet potato fries, and onion rings can be added on the side, and cola refills are available. On weekdays at noon a wait forms, so arriving before 11:30 is better, and an outdoor space within the large buildings is also available. Cigarette smoke from a nearby smoking area drifts into the outdoor seats.