Hopes From Darkness

after the war between the gods the humans had aquired an power called "Life manifestation" by using the users life essence to create powerful techniques. But life essence can only be harnessed with bonds and attachments to a person that they can't easily let go of easily, whether it was through emotional attachments to certain things or mental or physical trauma, and those who can harness them are called "exousia users". "Rei-kim Woo" grew up in solitude locked away from the rest of the world, because of the danger around him. without any choice his parent were forced to lock him away in an artificial forest in a cave system deep underground to keep him safe from any harm. he was raised by his mother's summon that taugh him everything they could. His mother's Exsousia taught him everything other than one thing. ''Emotions" summons are summons after all, they are different from humans who naturally grew up with emotions. It left rei ignorant and devoid of any understandings of human emotions. and because of it rei weren't able to have any bond with things, places nor people's making him unable to harness the life essence thats essential for using the life manifestation but after an unintentional event where a girl he met showed him her newly developed technique called "blood blade" surge of unknown memories flashed before his eyes. is he a regressor from the future who returned in the past without any of his memories? or is that memories from the future that his future self sent back to the past?