Possibly the OP is referring to the actual seat map of the flight.
In some cases of code share services (e.g. KL operated flight AMS to ICN, which also carries a KE code), KL technically splits the cabin and some seats are only available for KE pax, some other seats only for KL pax. Row 79 is one of the rows which often is dedicated to KE pax. However, at check-in, all seats are available for all pax (if they are not taken yet ...)