Which novels told the story of the female protagonist transmigrating to the Tang Dynasty and falling in love with Li Shimin's younger brother?

<strong> A Dream of Zhou Tang </strong> This novel was an ancient romance novel. It was about the heroine who had transmigrated to the Tang Dynasty and became Cui Yaoyao. She helped Wu Zetian ascend to the throne, but she fell in love with Li Shimin's younger brother, Li Xian. The female protagonist was hesitant between her career and love. Her rationality told her that she should be with Wu Sansi, but her emotions made her unable to forget Li Xian. Moreover, the rumors about Li Xian's death in history also became a test for her choice. I recommend this novel to you. I hope it can satisfy your reading interest.