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
It's literally the pure vs. the impure. ML was impure through and through, all the way from the beginning of the series, and Yeomin was pure through and through. Yeomin has been through ENOUGH things that weren't even his fault aka crazy people and ain't shit family. I hope every character gets what they deserve (only good things for baby boy tho ).
The first indicator (just my theory) is when MC's parents magically turned nice. ML aka lil bro is probably like a tree spirit or something and is manipulating the time and memories of MC. I'm guessing back when MC had that childhood accident, that's when he met the tree spirit, and that's why it had blood on it? I'm not sure, but I wonder what's really going on behind the scenes.









ლ(´ڡ`ლ) This was pretty hawt and sexy and they did the naughty scenes well. The positions were good too tehehehe