I am sorry that this happened to you, Kwan. That absolutely sucks. And it shows a really bad side of some human natures. Perhaps not being outright scammed, but being taken advantage of, seems to happen to every remote investor. So, don't lose your confidence!
Meanwhile, it sounds like you may have purchased in an area that may be C or D (drugs, etc.)? If so, it may be worth reviewing if you want to continue holding property in that area. C and D are really hard to manage remotely, I am told.
In the unlikely case he is licensed, you may be able to see if you can recover something from his bond. I hope you have a written contract of some sort. Google says you can search for MI licensees here:
https://aca-prod.accela.com/LA... for him and for future use.
Google says you can also search for MI cases here:
https://www.courts.michigan.go....
As you move forward, maybe also check references, licenses and court records, and reviews on other sites. You can also use buildzoom to see if a contractor has a permit record that buildzoom has record of (they only have some). And if so, search for that permit in the relevant city record (many are online) to see how the permit and inspections went. sometimes the permits will also have a dollar value (which may or may not be the actual value of the work done) that may be useful.
Good luck out there.