SPOILER
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it's Han sooyoung
Spoiler a bit more precise
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Yep it's Han sooyong.
But not the one we know.
More precisely, it's a part of Han Sooyong.
She has this ability called "Avatar" that allows her to split herself by giving some of her memories to a sort of clone of her.
However there is a moment where she explains that the first time she used her ''Avatar' she couldn't control her own ability, and she unwillingly created an Avatar with A LOT of her memories.
This Avatar became independent, and lives her own life, ending up in another timeline than the one Kim Dokja currently is.
Anyway a lot happen, I won't spoil it, but the author is, well a part of Han Sooyong who possesses a large number of her memories.
I don't even know if I'm making sense here.
Damn...my girl really didn't plagiarize
For someone who has read the novel....who is the author actually..? Is it Dokja's mother or someone he knows