So the system is supposedly his mother yet she had her memory wiped of being his mother? In that case why bother with the spirit transferring bit at all, it doesn't seem like it will tie into the plot in any way, so it seems a bit pointless.
"Ahem, Your taste in girl is nearly as same as mine, and I strongly approve." Mm just these line and you bought me. I'm gonna read it till end. 😇Someday i might use this line on my grandsons