(Modern setting) FL was murdered by her husband as she was confronting him cheating on her with her, then best friend, while she was already dying from end-stage cancer (expectant to die within 6 months), and was sent back 10 years.
ML is the regressor (he was in love with the FL in his past life too, and when he came back in time and killed all those fellow cadets, it was all for her; they were behind her being falsely accused of treason and being executed, so he simply took them out so that wouldn't happen again; it was all to save her)
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