Ojeje Gangnam is a Japanese restaurant near Gangnam Station on the Shinbundang Line that serves donkatsu and udon. Its signature dishes are low-temperature sirloin donkatsu, chewy matcha cold udon, and crispy kataifi fried shrimp. Even just before closing on weekdays the restaurant is crowded, and the Gangnam branch has a long wait. Note that prices are on the high side.