Gungdi Pangpang is one of the best runner games that I have played in awhile mainly because it brings back nostalgic memories of Mario Kart. The game offers team battles as large as 3 on 3, free for all mode, private mode with friends, and more. You don't actually need to have friends on your Kakao account to participate in the multiplayer part of the game and you don't need to understand Korean to enjoy playing.
However, like most Korean games, it does require a KakaoTalk account so if you don't have one yet, check out the tutorial section of my site.. Don't let the title 궁디팡팡 fool ya, this is a great game to play with friends or alone. Oh and try not to Google image search the title of this game, or you'll get a bunch of weird pictures! The title is meant to be silly :).