SOCIAL WORKER... I think it'd be interesting if Reigen somehow ended up working with Fai to any degree, since he was in the process of adopting a kid! Especially since Reigen pulled the kid off the streets himself and was fighting to also be the one to adopt him and was fighting hard for it - Reigen probably had to be pretty thoroughly evaluated and regularly checked on.
If that's not the kind of social work that Fai does though, there's also the option of Fai somehow being involved with Reigen's business - Reigen used to be a normal nurse, just enough to be able to prescribe medicines, but recently (past 6ish years) has been a homeopathic doctor in the area. He potentially has some less severely addictive pain treatments he could have offered Fai? Most of what he sells is placebo before sending people for proper medical treatment, but he also just does massages, meditation and prescribes marijuana. Plenty of options if you want to tie them on that end.
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If that's not the kind of social work that Fai does though, there's also the option of Fai somehow being involved with Reigen's business - Reigen used to be a normal nurse, just enough to be able to prescribe medicines, but recently (past 6ish years) has been a homeopathic doctor in the area. He potentially has some less severely addictive pain treatments he could have offered Fai? Most of what he sells is placebo before sending people for proper medical treatment, but he also just does massages, meditation and prescribes marijuana. Plenty of options if you want to tie them on that end.
Or, heck, both?? Or any other ideas!