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Well if we saw the intro from the red head point of view first I'm sure your thoughts would be different? Like you have your man but this wench that was forcefully put on your lover is trying to get all this love and attention when hes obviously not interested? Like that would annoy the hell out of me and like for this time period execution is obviously very common (it just seems bizarre and cruel for people like us who is taught to consider every individual as important)
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If I seen it from the view of the red head mistress I would think she was one of those unreasonable mc's and the mc's sister did want love but she wasn't trying to get all of it second the king picked her and treated the mc sister like shit no matter what view I see it the red head mistress was in the wromg for "allegedly" framing a innocent family to death for a petty love especially when the emperor obliviously love the mistress not the mc's sister
Honestly, I kinda get the red headed villainess. She was there FIRST. It doesn’t mean that she’s excused from what she’s about to scheme but it’s really kinda understandable that she’ll fight to stay beside her lover.