@hannahhunt
You're welcome. :)
I do think that the story would seem more realistic and accurate if the name was changed to a Korean name. Honestly, the name bothered me since I read the summary of the book, but I held off from mentioning it because I wanted to wait and see what you revealed about his character, etc.
Of course, not all of your readers will catch on to the fact that Koi is not a Korean name, and I can see that you've put a lot into the story. If I was in your position, I'd be pretty frustrated at having to part with his name, since it carries his character, in a sense.
I can't help but feel a bit sorry for bring it up, but best of luck. I'd love to hep you if you'd like it. :) In any case, keep writing!