I think the older sister is framed and then the younger sister got poisoned so the original soul of the younger sister got possessed because of the eye color change
Comment by zaaaa on Into The Light Once Again - Chapter 1
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@zaaaa that's exactly the main story line of most stories the older sister gets accussed of poisoning or nearly killing the 'innocent' younger sister adn her family turns on her because the youngest always gets the bewtter treatment honestly it's so annoying tho it's always nice to read