I saw this thread a few days ago and I was gonna come in here to add "The Dongbei Tiger" Guan Wang, but I figured I would just research myself as to what happened to him (you guys should do the same because come on, some of these names... a less than 30 second Google search can give you what you're looking for)
Anyway, in case you don't know him, he has a record of 20-1-1. He made his UFC debut in 2017 against Alex "Bruce Leeroy" Caceres. He won the fight via split decision, it was one of those weird split decisions where one of the judges was on crack or something because it was a clear win for him... and then he disappeared.
He supposedly retired after that fight, got married, moved back to his hometown in China and opened up some businesses. He's raising a family now and apparently he's doing well.
So yeah, just in case anybody out there was wondering what happened to The Dongbei Tiger aka Guan Wang, you're welcome.