A Concubine Slips Over the Wall

"My advantage is that I'm old and nobody wants me." Guo Lu transmigrated and became an old concubine kept by a prince. A twenty-eight-year-old old woman! Good heavens, she was even forcibly bound to a System. Become the emperor's favorite and ascend to the throne of empress. A concubine in ancient times dreaming of becoming empress? She must be crazy. And not just any concubine: she's the old favorite of Prince Yu, the emperor's own younger brother. "Fail the mission, and you're dead." The System was that cold and merciless.