According to what he said, a human soul has several parts and one of these parts, the eternal soul, it's not something that a person borns with, but builds it as they live. So, Minchan already existed as a boy and Muyeol (thanks for say his name, because I never remember haha) placed Seoho's eternal soul in the empty space reserved for the eternal soul that Minchan would acquire in the course of his life. So, Minchan became a result of Seoho plus Minchan. As he was still very young at time, his ego was formed by this result, so to me, is like a sort of reincarnation for Seoho (to be a new person, but still have the essence of being his old self). He could habe been entirely his own person, but he didn't have the chance because, very young, he was mixed with Seoho. Muyeol wants to place the rest of the fragments of Seoho's soul, and as more fragments are there, more Seoho he will be. I think the goal is reach a point where Minchan remembers to be Seoho and feels so much like Seoho that he doesn't feel like Minchan anymore. In other worlds, Seoho's ego will absorb Minchan's and Minchan, regardless he still has memories or not of being Minchan, won't feel and behave like Minchan anymore, only as Seoho. With time, Minchan will feels like a second personality that disappeared when the main one took over again.
Omg that makes so much sense! I completely forgot about the parts of the soul. Damn, the lore is DEEP. Thank you so much for explaining!!
So her dad went to the same high school! I thought it might be her brother and maybe she forgot when she tried to suppress the trauma from the kangsan tragedy but that wasn't the case. Aww. This is such a tragic manhwa uff. Also, I guess the reason Minchan looks identical to Seoho in the first is because the fragments of Seoho's soul shaped the vessel to look like the owner of the soul. Muyeol says that pieces of Seoho show up in Minchan's behaviour, but it's clear that Minchan is his own person. The question remains, is it so because Minchan's own soul still remains in his body? Or did Muyeol remove the original soul from the body? And if he did do that, then can a body survive with an incomplete/broken soul?