I assume you mean how will John know it`s Korean ? Systems normally have a person`s name and an ID number on a little tag at the back..... he would know Toplace tags from others and he also has the user names of the unhappy Korean systems wearers from the forum here [and their e mail addresses etc ] ..... if you mean how would a wearer know where their individual system was made, we are talking about a specific company which supplied them to these unhappy people, so they know themselves who that company is..... regards, Paul.
p.s. if you are in doubt as to where your system was sourced, you could e mail John with the name of the company you bought the system from and he will tell you if it`s the one being referred -to.