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Mureum's life starts of in media res-- He knows he was created by Someone, Somehow, but everything else is a blur. I think he's going to have been dropped off at an abandoned (yet taken care of *think emoji*) farmhouse, where he lives with who is initially assumed to be the farm's former owner's spirit, Taelia, haunting the land.
Unbeknownst to either of them, Mureum's creation caused two souls to vanish from the archive of the afterlife, making him a wanted man. When he is finally found, it's a shock to the demon who scouts him out (Hell's bookkeeper, Endo) that resurrecting the dead is even possible, and is convinced to let Mureum stay on Earth until they can figure out who and how this happened.
Mureum is then invited to live with Endo until they can both return to the afterlife, to which realizes two things: One, it's hard to feel like a person when you're a 6'7" man made monster, and two.. Taelia isn't haunting the land, she's haunting him.
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It's been at least a year, during that time Endo has fallen deeply in love with the human world. He is out a lot and it's resulted in the amount of leads they have on where Mureum's creator could be drying up.
While this means Mureum and Taelia are allowed to live longer, Mureum has begun to realize that maybe he truly doesn't belong here. He wishes to socialize with other humans, but can't help but feel like his monsterous appearance has people realizing he isn't actually a "real" human and that they will either reject him from society or try to cause him harm.
He is jealous of Endo for having the luxury of being able to at the very least blend in physically, and it causes Mureum to withdraw from others and pick up unhealthy habits. During this spiral, Taelia seems to be around less often, making him assume that the only human he has ever known and has been shown kindness from is pushing him away as well, furthering the spiral... Until he suffers a medical emergency.
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Upon further investigation, it's concluded that the reason Taelia was haunting him in the first place is that they share a heart. With that knowledge, they're able to piece together who exactly Mureum's creator is, however the heart attack has caused Taelia to return to the archive of souls before naturally being able to move on again. Endo and Mureum venture off to Hell in hopes of recovering her without being caught.
All of this is a mess, but how they get her back is kinda unknown. The ending would very loosely have Taelia return with the opportunity to inhabit a body of her own (with her heart? maybe?), Endo would give up all that he's worked for in Hell to live a life as a normal human, and Mureum would have the opportunity to live out the rest of his life the best he can (Either he has a heart transplant that makes it so he can live a little longer and Taelia and him both have abouutt the same amount of time left on Earth, or he keeps their heart and would pass before both Endo and Taelia, but his journey has given him what he needs to truly embrace the time he has.)
Wow <3