The Right Way for a Cannon Fodder Side Character to Survive

Please leave comments and add this to your bookshelves~~ QAQ This is my first time writing, so I'm still learning. Feel free to give me suggestions; I'll read them all carefully!! (๑>؂<๑) But don't insult me. You can insult my book, just don't insult me, okay? () Jiang Jinruo transmigrates into a book after staying up all night to finish reading it. Other people transmigrate into the heroine or an important character, but Jiang Jinruo gets neither. She becomes a supporting character with the same name as herself. She's not wicked, but she is cannon fodder. This Jiang family daughter, who marries the hero at the beginning, is frail and sickly. Just a few months after marrying him, her condition worsens and she dies young. She doesn't make it past Chapter Five. The hero marries the heroine instead. Their daily life should have been peaceful, but the second male lead, the villain, keeps disrupting it. By opposing the hero, she manages to survive until just before the epilogue. But the System wants this bit player to make it to the ending. Jiang Jinruo: ...Are you serious? Marrying the hero is clearly out of the question. But marrying the adorable villainous second male lead should be fine, right? After all, aside from opposing the hero, he hasn't done anything bad. QAQ That's right, it's all about staying alive! Transmigration into a book, one-on-one romance, married first and in love later, both leads romantically inexperienced.