Reborn, I Solve Cases and Wreak Havoc in a Household Intrigue Novel

I transmigrated into a story of household intrigue as the most miserable concubine-born daughter. According to the plot, my legitimate sister would bring about my family's ruin and death.

This time, I decided to strike first, secretly gathering evidence that my stepmother had poisoned the concubines.

But I stumbled upon an even bigger secret in Father's study: it turned out my family was merely a hidden piece on the royal chessboard, and my legitimate sister had long been under a prince's control.

I offered my allegiance to the iron-blooded prince, rumored to be ruthless. "Shall we work together? I'll help you claim the throne, and you keep me alive."

The prince chuckled. "Little concubine-born girl, what can you possibly use to contend with my vast army?"

I silently laid out the evidence of my stepmother's crimes, along with secret letters proving the Third Prince was building a faction for his own gain. "Is this enough?"