I keep thinking about what you said that 704 is innocent... but what if he isn't? maybe he committed suicide (in some religions this is the biggest sin that can be committed, as you are denying God's greatest gift: life). This may also explain all the guilt/pain/anger Geumsun felt when he met 704 for the first time (I think he still fells like it btw)
I really don't think 704 being a reaper has anything to do with Hwan
well that's just my opinion ╮( ̄▽ ̄)╭ I love making theories
Ialso thought something like that! My first idea was that Geumsun and 704 were lovers in the past but somehow they were forbidden to love each other so 704 comitted suicide, resulting in him becoming a reaper. However if tgat was the case Geumsun would KNOW that 704 is that human he was in love with so he wouldn't be mean to him...?
omg! that's a really great theory. I forgot suicide is considered sin in some believe! Maybe Geumsun felt betrayed by 704... but why would he hate him for so long if the soul is of human 704's ... Geumsun is treating 704 as if he's a different entity from the human 704... This is making me so curious now xD

The author did imply that 704 must be the human that Geumsun used to love. The real question is what kind of human is he, what criminal did he commit? Cause all the reaper did a lot of sin before, that’s why they don’t deserve a name nor a memory of their past life.
My theory probably the reason Geumsun is mad at 704 being a reaper, is because the human 704 not supposed to be a reaper (he didn’t do anything sin) probably connected to hwan?? Is this also the deal that Geumsun and Yama made? To restore 704 memory? Who knows.
One thing for sure, all reaper used to be human, but they don’t have emotions… it’s prohibited because emotions will render their work. Earlier chapters said that one reaper used to develop emotions towards human and was sent into deepest hell…. I hope 704 won’t be thrown into hell…. He clearly learning to feel love towards Geumsun now….
I feel so sad for Geumsun, I want to know his angst story… what his past is all about.