Haha I had to look up what dbm meant lol. You're totally fine! I should've added that in my previous comment.
It's the stamp (with Chinese letter) you see in his case info photo.
Business is now defunct but the address associated is 609 Erin Street, Winnipeg, MB, R3G2W1. If Doe was an international student in Winnipeg he probably would have attended one of the bigger universities, University of Manitoba or University of Winnipeg. I am more inclined to believe it is University of Winnipeg, as it is about 6 minutes from the address listed above.
There is also a smaller Christian university named Booth University that he may have attended. It is located close to University of Winnipeg.
I just learned that one of the well known Korean crime docu tv shows is seeking information regarding this case:
I hope they reach the right people who know about him finally.