geraineon, 
I was trying to find that Singapore kopitiam AU but I cannot find the one I read. Instead I found this:
https://archiveofourown.org/works/38625864/chapters/96560331
it's wangxian (so definitely not this because... I don't read wangxian), but if anyone's interested, here you are!
based on the summary? yes, Singaporean writer (either that, or Malaysian writing a SG AU)