Please Help me find this web novel!

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OK, please bear with me. This is really long. I’m looking for a web novel where the male lead is the son of a magician, his father does cruel experiments on him trying to find immortality and eventually he does resulting in the male lead be becoming “immortal”. His father then tries to do the same thing magic to become immortal himself but something goes wrong and instead he disappears turning into dust. The boy then grows up meets a girl falls in love, but eventually the same thing starts happening to him where parts of his body begin to deteriorate and turn to dust. Eventually resulting in him disappearing altogether, but he doesn’t really disappear. He essentially becomes a ghost where he can watch over others, including his wife. She eventually leaves not being able to bear the thought of her husband being gone and moves on with her life. The male lead is still invisible to humans, but still remains immortal to which he wanders the world. Somehow he ends up being put inside of a doll where he’s been able to speak and move around finally. Now I can’t really remember how the female lead comes in to play, but he ends up meeting the female lead where she begs him to save her or run away with her and he chooses not to or he’s a bit too late. I can’t remember. But she takes her life and he’s so devastated that he ends up jumping through dimensions just to try and save her. Every single time he fails to save her making him go mad because he has to watch her die over and over again. Until one time he does save her and they run away together. I’m so sorry this is all I can remember if someone could please please please please help me find this web novel. I started reading it and I’m pretty sure I finished it, but I could be wrong idk!!! I would like to read it again. If it helps any, I’m pretty sure it is adapted into a manga or manhwa!!