I Transmigrated into a Book Set in the Seventies: The Fallen Soldier's Replacement Bride Marries a Veteran

When Ji Yunshu woke up, she was horrified to discover she had transmigrated into a book. Worse, she had become a martyred heroine whose identity had been stolen. She was about to be caught in bed with someone and set on the path to her death. Since staying alive was the obvious choice, she decided to keep her head down and marry Liang Youjing, a veteran who was supposed to die in a month. At least she’d have a roof over her head. But why was this man getting more and more long-lived?