I am very curious about the brother, since they both look very much like their ancestors. Does the elder brother have any possessive feeling over the mc? I am thinking the guy in the last panel might just be a reincarnation or a investigator hired by the older brother.
What a great word to put it in, it could actually be the brother who hired someone to stalk Taehyuk (idk if that's how you spell his name). And yes the brother is possessive over him but I'm not sure in this present he is now. He could have a little bit of possessiveness, but that's just my theory. You could go on BATOTO since it haves more chapters than this one.
The mysterious man gotta be the one who killed him in the past or either the brother or a new character