Gangnam Jinhaejang is a Korean restaurant near Exit 12 of Gangnam Station that serves gopchang jeongol and yangseonji haejangguk. The gopchang jeongol comes with plenty of gopchang, mushrooms, and vegetables, and can be finished with udon noodles or fried rice. It is open 24 hours from Monday to Saturday, and a wait forms at lunch. The broth is on the salty side.