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im pretty sure they do, at this point, I'm assuming when two characters are that close in the cover like that they'll end up together. I think it's going to be a similar situation to the "The Viridescent Crown manga", though i prefer that to another where she looks like the ml's dead sister. at least they're not blood-related at this :''''')
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The comic is based on the novel, you can find information about it here https://www.novelupdates.com/series/the-precious-sister-of-the-villainous-grand-duke/ unfortunately the translation is not very good, it is practically a mtl
PLEASE STAY ON BROTHER AND SISTER RALATIONSHIPPP if they became couple i dont think i can continue reading this