I feel like the person that Samantha talking about would become Greed after all the guy is also strong and closely related to the MC, which means in the near future he would surely become an important character besides the MC based on the prophecy that the girl see
I really like where this is going as there is someone stronger than the MC in the future. Even tho there were 4 people who had the bell ring, only one person surpassed him.
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