Firefly Ashes and Light

After Shen Zhiqian is falsely accused, his sister Shen Liuying enters the imperial entertainment bureau to find evidence. She is taken by Prince Yan Linchuan, becomes pregnant, and faces persecution. The prince saves her, and the two team up to investigate the conspiracy of the Crown Prince and the Grand Preceptor. After defeating the villains, the Crown Prince assassinates the emperor and seizes the throne. The prince counters with a clever plan, ascends the throne, and establishes Shen Liuying as his empress to rule the world together.