My Updated Theory: "MC falls down the cliff and gets blood on an old tree that was sealing away an evil spirit and the blood breaks the seal"
So I do still think the "little brother" is a spiritual being of some kind like a ghost or just a tree spirit, but he definitely met him when MC was a kid. It might be another "wish granter" type thing where child MC wished to see his parents happy and not abuse him anymore or something, and the spirit granted it because it was locked/sealed away nearby (because this dude ML is clearly insane).
Or it could be like "I'll heal you in exchange for your life" but not in the sense of killing MC but making MC his? Not sure but we'll all see what the heck is going on in later chapters I suppose (づ￣ ³￣)づ
My Updated Theory: "MC falls down the cliff and gets blood on an old tree that was sealing away an evil spirit and the blood breaks the seal"
So I do still think the "little brother" is a spiritual being of some kind like a ghost or just a tree spirit, but he definitely met him when MC was a kid. It might be another "wish granter" type thing where child MC wished to see his parents happy and not abuse him anymore or something, and the spirit granted it because it was locked/sealed away nearby (because this dude ML is clearly insane).
Or it could be like "I'll heal you in exchange for your life" but not in the sense of killing MC but making MC his? Not sure but we'll all see what the heck is going on in later chapters I suppose (づ￣ ³￣)づ