Koshi Seoul National University Station Branch is a Japanese restaurant near Seoul National University Station that serves udon and donkatsu. It offers chewy cold udon, soba, and crispy donkatsu. The banban katsu contains a lot of cheese and comes with fried shrimp, fried pumpkin, and inari sushi. The noodles are chewy and springy, and the donkatsu coating stays crispy to the end while the inside is soft.