We just met, so I don’t know him that well, but he was honest from the beginning. He says he’s still married because of their son, and because his wife doesn’t want to get divorced right now. Apparently, South Korea has a fault-based divorce system. TIL.
Being dead or MIA is a very specific and powerful state of being where most laws completely change. Being alive but not known (to you) where they live is completely different. The system will show them as alive and paying taxes but accessing and sharing address and contact information without permission is various levels of illegal and will get flagged
Best bet is private investigators. They still exist and are good at OSint and tracking people down by the faintest trails