
that's what I've been thinking too that SM is not just your normal Vampire. Everyone's saying that he's halfblood or converted jus coz he lives on his instincts which is uncontrollable hunger. But I don't think he'd be a converted vampire coz those wouldn't be on par with strength with BM since BM is a fullblood. And what's weird is his original haircolor is white, and as we've noticed it was black since ch 1 but it changes back to white whenever he drinks blood directly from people. So my final conclusion is that he's a mutated vampire. Does that make any sense?

I agree that he's some other strand. When BM drinks a lot his hair becomes long and his ears become pointed. and throughout the manga its shown that when BM hears SM's hair and eyes turned white, he's like 'oh shit, not good, that's not normal'. Even on the bridge where they first met BM was like 'what's this' Referring to SM like he was different.
And yes to the comments people that people made! BM and SM both make comments to half breeds. example when they went to save Hansoo when she was kidnapped they both made a comment to the half breed. Half breeds seem to be looked down upon. SM is not a half breed looking down on a half breed. BM would have made a comment about that if he was. SM is a pureblood, what kind idk but a pureblood non the less.
I was speculating that SM might be more ancient than BM, like when you level up you gain white hair??? lol idk

omygod you're all spot on !! I was thinking the same thing!!! And here I thought no one understands ╥﹏╥ , and what I'm guessing is maybe SM is somewhat a long time sleeping vampire who suddenly woke up from deep slumber --- That'd explain his clothes when he was wondering around feeding then he met BM on the bridge, that white fluffy cloak which was bloody btw. and was tattered.
I really feel like BM is stuck with so many sad/bad memories & moments since SM doesn't seem to remember a lot of stuff. I'm assuming that SM kills everyone at the banquet and just like how BM came to see the bodies of the people, maybe SM can drink vampire blood and he killed all the pureblood vampires. Since its a gathering of all of the pureblood vampires, maybe that means they are the only 2 purebloods left. I hate how BM blames himself for so many things.
Going to talk about their connection again because, if SM can/does kill all those purebloods then he has to be super strong. that girl pureblood called BM a Duke so I'm assuming he's a higher ranking vampire and one of their stronger ones since, above the Duke would be the king. and that would explain why he can hold his own against SM. SM even stated that BM is super strong, that could be instinct from memories he can't remember. and maybe that's what first attracted him to BM, he smelled him and was like 'this ones strong, this one can survive and stay by me'. I'm making guesses cause he doesn't seem to have any interest in the other vampires at all. and still listens and looks for BM. Even present day he still just listens to BM. He complains but he's devoted to him. I really wanna know what kind of different vampire line SM comes from cause he's clearly different from the rest.