spoilerssss
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The book 'Silence' is the original world which means the real world has an ABO system. After Huimin passes away he wakes up in an alternate world, the normal world, and Iheon is his friend there. The normal world is made out of Huimin's imagination of a safe space, where he reads the book 'Silence' (Iheon somehow gets dragged into the alternate world where he pretends to be normal and a different Iheon according to Huimin's imagination).
Remember how the manhwa started with Huimin waking up in the 'silence' book when in reality, he returned to the past when he first met Iheon. He remembers the past but thinks it was the book involving characters Huimin and Iheon. Sometime in the middle of the manhwa the Iheon who was stuck in Huimin's safe world also returns to the past and now we're reading that part.
Ok so like let me get this straight?? There’s a book world and the real/original world? So book huimin was originally abused but brought back to the past and replaced by the og world hui? By book worlds iheon???? What happened to og world iheon? Is he also involved somehow? Since he mentioned something about fate back when he went out with hui? I’m like lost 80% of the time but it’s a pretty interesting story, will keep reading!!! Stay strong hui..