Reincarnated into a Doomed Novel as an Unknown Extra

What would you do if you reincarnated into a doomed novel? Would you rely on a system to get stronger? Steal the protagonist’s opportunities? Kill your future enemies before they even rise? I had none of those options. I only read the free chapters. No cheats. No system. No future knowledge. But that doesn’t mean I’ll wait for death. If the world won’t give me a way to win—I’ll just carve one with my own hands. * * * * * Note: R18 isn't for detailed sexual content, but for dark theme, gore and all.