How can Kai do it so right upstairs and Kosin do it so wrong?  The mac and cheese and short rib were awesome but the salads, salmon, and service were so bad.  We have been to Kai and loved it so many times and always thought we should try Kosin.  Never again.  It's unreal the difference between the two restaurants.  Seriously the service was horrendous.  Have you no idea how to clear a plate, bring new silverware, refresh drinks, bring the app before the salad, etc?  We couldn't even get water for 20 minutes.  Is this real life?  It's a 1 star experience for the money if you don't order the mac and cheese and short rib.