Responses
Agreed. We don't know how long MC has been dead - logically we want to think it wasn't long after death, since he would have rotted way to much, but who knows. It's possible that he's been dead 10ish years. Maybe the LI dug up MC and put him on ice or something, but there is like zero percent chance they didn't know each other before this.
I think the guy said the experiment only work on freshly dead corpses. So he probably only been dead for like a day or 2 I wouldn't think no longer than a week. I'll be surprised if it was longer
Something tells me that they knew each other before this so that is why he is obsessed with his memories. Maybe he died many years ago and white haired dude spent all those years for research and finally managed to turn him a zombie. Who knows.