I Brought My Pocket Dimension and Became a Cannon Fodder in a Torture Romance

[Spatial storage + transmigrate into a book + romance + playing the fool to catch the tiger]

Xu Zhaozhao transmigrates into a tragic novel she's read, becoming the cannon-fodder princess consort. The male lead loves the heroine but is forced to marry a woman he doesn't love. At first, both the hero and heroine are stubborn and sharp-tongued. To make each other jealous, he goes out of his way to show the heroine how much he loves his wife, while she goes out of her way to show how much she cares for her childhood sweetheart. After plenty of heartache and angst, the misunderstandings are cleared up, the two fall in love, and the male lead plots to kill his wife, then secretly kills the heroine's childhood sweetheart. The two of them get their happy ending, and the story wraps up in celebration.

None of this should have anything to do with her, but somehow she transmigrates into the story as the wife! What? She's just going to die for no reason at the end? No way! She'll change her fate.