After Transmigrating into a Book and Being Reborn, I Became a Couch Potato

Jiang Yuan transmigrated into a book, becoming the cannon-fodder wife of a devoted second male lead. He was the heir of the Marquis of Wu'an and a famed general known as the God of War in the capital. But because he loved the heroine too much, the male lead saw him as a thorn in his side and found an excuse to exile him to a bitterly cold land. Naturally, his cannon-fodder wife went with him, and then she died. That's when Jiang Yuan transmigrated into the body of that wife, Jiang Zhiyan. Owing the male lead's mother her life, she honored her promise and accompanied the male lead into exile. Just when they were finally about to make it through, the second male lead died for the heroine. Yes, that's right, he died. Fine, so that's how you want to play it? Jiang Zhiyan was exhausted. Let this damn world burn! She was implicated too and executed by the male lead, but she never expected to be reborn. In this screwed-up world, she gave up trying. The second male lead could do whatever he wanted; she wasn't getting involved. But to her surprise, he was reborn too. In this life, instead of trailing after the heroine, he came to disrupt her peaceful life. She told him that in her previous life, she truly hadn't loved him, so he really didn't need to make it up to her. She had only accompanied him because someone had entrusted her with the task, and she intended to see it through.

P.S. Both leads are reborn, both of them! At first, the male lead really loves the second female lead, the original heroine, and has to go through the whole chase-your-wife-to-the-crematorium routine. Since the heroine never loved him in her first life, she doesn't hate him either. She simply doesn't care.

An alternate setting, so don't overthink the details.