Dear Mr. Kim-sshi,
So I’m not Korean, in fact I’m not even Asian! and as clueless as I am about this whole culture of yours I hereby make my point expecting already to be laughed at!
Just to make the matter worse, let me remind you that I’m actually a fan. By saying this piece, the bells in your mighty head should be in the process of ringing as of now, that another demanding fan is up for talking some nonsense and putting finger on something very irrelevant to her business. But hey, believe me it’s not gonna be as bad as getting furious over light of some light sticks! *shaking head*
Dear Kimsshi, I have a problem with this “JOHN HOON” name you chose! I know that I have a long way to understand your culture and tradition, but I have a right to ask questions, right?
Wikipedia informed me that Korean names follow the last-name-first rule. No problem.
As for the next two given names, the first one is your personal name and the last one is the common name which is also given to all your male relatives. Am I right so far?
All the intro aside, I for a fact understand that you are also on a verge of persuing your quite successful international career, and in need of some internationally appealing stage name for that matter. But what I cannot understand is, that when you came up with the name John for Jeong (Quite impressive effort ^^)….
BIG PARANTHESE OPEN
But, even so I think you are too pretty to be called John (most Johns I know are tall and skinny, and not that handsome by the way!) but who cares what I think :p
BIG PARANTHESE CLOSE
….you could simply call yourself John or John Kim *shrugging*
What’s the story of this half ass dragged Korean name of Hoon attaching to John! Believe me if it had a voice and knew you could hear, it would cry its heart out!
So, you wanna show your loyalty to Korea? That last name of yours even tells my 90 years old grandma you are from Far East!
But if your so happy with that birth name of yours! Why even bother to change the spelling to John? Jeong is far much prettier to pronounce! And this is a non-Asian speaking!
I appreciate any further enlightment on this massive confusion on my part 
Sincerely yours
ShenYue
John is just used for his Japanese releases. That’s how the Japanese pronounce his name.