Can't Get the Character Setting Right [Quick Transmigration]

Hai Xiaotang somehow transmigrated to a time before the tragedy began. Her identity card was set, but she couldn't learn what her current identity was or what ties lay behind the person she had to save. And so the story could go like this: [You will transmigrate to 24 hours before the villain destroys the protagonist. Stop the villain. Identity: The villain's lover.] Hai Xiaotang slapped her thigh. "How hard can this be?" "Darling, just let him go." The villain immediately put her in a chokehold. "You teamed up with him to frame me, and I didn't even come after you. Now you're coming to me? Fine, we'll settle all our business at once." [You will transmigrate to 24 hours before the villain destroys the protagonist. Stop the villain. Identity: The villain's archenemy.] With an awful identity like this, it looked like she could only use force. Standing shoulder to shoulder with the protagonist, she said, "If you try to kill the protagonist today, I'll fight you to the death." Clang! The villain's long sword fell to the ground. He smiled bitterly. "All you had to do was say one word, and I would have gladly handed my life over to you." What the heck? Theme: