why some iphone 4s has korean letters at the back and not the same with the most iphones..but the serial and software are all the same..so why there is phone with korean letters on the back it says.. kcc -cmm- apa -a1387

I bought it in some mall here in our place..im from philippines.. im worried about this coz its different with other iphone at the back.. it says designed by apple in california..then its all korean letters at the bottom it says KCC-CMM-APA-A1387..i checked both serial number from the phone in the box and in the sim card slot and its all match, i checked it also in apple service and support coverage and it says : valid purchase, your product is eligible...and it shows i have 90 days technical support,and my repair and service coverage is active....pls help what model of iphone is this its working and i can sync to itunes,icloud and etc..thats what it says on the back on the image ia

is there anyone who can help me about this ? i asked siri who made the phone and she said as what it says on the box the phone was designed by apple in california... when someone saw my phone they are thiking it was fake since its different at the back with other iphones..it is working perfectly with itunes,icloud and apple website..all the features of iphone 4s working..only that symbol at the back bothers me..pls help why this phone is different..i bought it in a mall here in our place..in philippines..it comes with box sealed with all original accesories..but the manual all written in korean..