Responses

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Yep he did. He participated in hurting her, knowing exactly what would happen, and agreed to marry her sister. Mainly cause as shown in the manhwa, he has an inferiority complex due to people viewing him not noble-class and looking down on him for being from another world. He wanted that recognition and became greedy so he agreed to the plan. He only regretted it after he already did all those stuff and chose to turn back time when he realized he loved FL.
I really had to ask, How are we so sure that her ex fiance was involved in her death?.
And girl, are you really believing what you half sister who hates and tortures you for a living is telling you the truth ? There weren't anything clearly implicating the guy so I'll hold off on blaming him