Responses
Mummy....brainwashed the Prince, not the female lead. It still took her 10 times guillotine and still blushing at him?? Not to mention her entire family was killed 10 times. Does she have no feelings for them?? Looks like this prince brainwashed her in her first life.
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I have read this on artlapsa and the manga uses the brainwashing trope. It's implied that the ML has been brainwashed by the saint. He reincarnated along with the MC ten times. He is sane for a short time after regression but loses his consciousness each cycle, and only manages to snap out of it during MC's execution and repeats the cycle.
I suggest to read this as mystery rather than romance.