Posseom is a Vietnamese restaurant in Mangwon, Seoul, serving pho, bun cha, and cha gio. Its signature dishes are galbi pho and seafood pho, with a rich meat broth and a seafood broth that carries a smoky char. The restaurant began as a food truck before opening a storefront. Solo diners eat at the bar, side dishes are self-serve, and cilantro and lemon must be requested separately.