He's the real Huimin isn't he?

I have the same inkling

I have the same feeling...AND the fact that the "evil" ML has those memories too shocked me

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yeah, he just doesn't have the memories of his past life compared to Iheon, who remembers them all

but what about his life outside the novel?

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They're also part of his—their past lives. The only catch being is that the current Huimin believes this world is a part of the novel and the modern is the real one when in reality, his consciousness just came up with it as a defense mechanism against due to trauma of his 'past life' (where he got the miscarriage, the og one).