Saving the Villain in Progress (Transmigrated into a Book)

Scheming beauty x sickly, obsessive villain One day, Tang Qingge wakes up and finds herself transmigrated into a fake heiress villainess in an ancient-style romance novel. The fake heiress enjoys a life of luxury in the first half of the story, but meets a gruesome end at the male lead's sword. To change her fate, she saves the biggest villain in the book. While he's lost his memories, she showers him with care and tender affection, laying a gentle trap so she can cling to him and stay alive later. Who could have guessed that the day after she took a sword for him, she would wake up with a sharp blade at her throat? The man she'd had wrapped around her little finger just yesterday is suddenly cold and ruthless. "Who are you?" "...?" What happened to repaying my kindness? All she can do is pretend to be on the verge of tears, looking pitiful as she says, "Didn't you promise to marry me?" The man scoffs, not believing a word, and leaves without a second thought. - One night, Tang Qingge is abducted to the empress's bedchamber. The man who had treated her with disdain now gazes at her with bloodshot eyes. His broad palm rests on her slender, pale neck, stroking it slowly with utmost tenderness, as if he might strangle her the very next second. He leans close to her ear, his voice hoarse. "If you were going to lie, why didn't you keep lying?" "I can give you his life, the throne, or the whole world." - #She only clung to him to stay alive, who knew she'd end up getting an empress's throne for free# An alternate-history setting. Important: The plot is full of old-school melodrama and cliches. If that's not your thing, please don't read it. Thank you. Both leads are virgins. Theme: Great things are built from the ground up. Success comes only through your own efforts.