Dongsin Chamchi is a tuna restaurant on the basement level of 143 Mapo-daero in Mapo-gu, Seoul, a three-to-five-minute walk from Exit 3 of Gongdeok Station. It serves tuna hoe, and the manager butchers the head in front of guests and hands over each slice one by one. Every seat is in a private room, which suits business entertaining or a meal on your own. Guests eat while hearing an explanation of the tuna.