Poongnam Dangsan is a Vietnamese pho restaurant across from the underpass that leads from Dangsan Station Exit 4 to Hangang Park. It is run by Vietnamese people and serves clear oxtail broth pho, mixed noodles, and pork rib rice bowls. The interior and outdoor seating are decorated in a Vietnamese style, and passing through the tunnel in front of the restaurant takes you straight to Hangang Park. Lines get long during peak hours.