I love Mi Madre. Their chicken paella lunch set 9,500 won (1,500 won extra for added seafood) is a bargain even though they've recently started charging 10% tax on top of their original prices. Friendly service, extra appetizers and coffee or tea are thrown in for free.
To get to Mi Madre take the subway to Noksapyeong station and head down towards Haebangchon. Mi Madre is on the right hand side of the main road just past Italonia and Thunderburger and directly above Standing Coffee. If you hit the tiny Buddha's Belly cafe, you have gone too far. Contact them on 02 790 7875.