Alexi Yin is the Chief of Security for the governor of Eros. Even though he works for an Earther, he has had a soft spot for his fellow Belters and has been known to help out some of the youths who find themselves in a bad situation. This has been ever more apparent since losing his only child in the Destruction of Anderson Station just a few decades back.
 
Yin has a brother in Ceres Station OPA  who works for Anderson Dawes and as such has regular backchannel contact on happenings going on in the Belt.