Not sure which korean food you miss or like.. but if you are not looking for korean bbq, try Mi Mi Sa at Bahnhaldenstrasse 2. Much more reasonably priced than other places but very casual (adjacent to grocery section), so not for dinner date or meeting.
Never heard of this place, but I adore Korean food and need to check it out, the reviews are all positive!
The other best Korean restaurant in Zurich: your kitchen. I cook Korean all the time using recipes from www.maangchi.com , and they invariably come out as good as in restaurants!
One recently opened in Seebach, directly opposite the Post Office in Bahnhaldenstr, and 3m walk from B'hof Seebach (S6) or Tram 14. Called MiMiSa. TEL:076 282 6772 I didn't try it yet. There's also a Lebanese Resto nearby combined with a musical instrument shop + a street vending van! Together with a Vietnamese resto 100m along the main road from there, and a Syrian hairdresser called Palmyra, the once boring suburban nowhere is becoming a lively non-European hotspot - well a little bit
Not in Zürich -- but those lucky Bernières in our capital city have Louis' BBQ. He does excellent fish dishes (specialising in tuna and other pelagia) -- the best is the "Bluefin Mandolin".