Responses

I think there is more too that little one shot memory, because the ml doesn't seem like a person that does that to our fl, and we could get a plot twist later on that it was not actually him that did it but a part of a illusion or something (not sure) or maybe because she doesn't want/cant remember (what really happened). but I can't really say for sure right now.
In the past life didn't the FL basically raised the ML like her own son? How could he kill his own master who raised him? I don't care what the reason is.