The Princess of a Golden Age (Shèngshì dì nǚ) 《盛世帝女》 by Jie Yu 【完结】

Synopsis

She is a princess of the Sui Dynasty, with a distinguished identity, but she conceals her true name, disguising herself as a maid and entering the governor’s mansion. There, she encounters the dancer Wu Meixue, whose appearance is identical to her own. Is it a mere coincidence, or is there a hidden connection? When she attempts to assassinate Governor Li Yuan in front of a crowd but fails and is surrounded, by a twist of fate, she takes on Wu Meixue’s identity to remain in the mansion and wait for another opportunity to strike.

He is the second son of the Li family, handsome, talented, and exceptionally intelligent. He is dedicated to capturing the assassin but doesn’t realize that the assassin has been by his side all along. In the end, it becomes impossible to tell whether love or scheming prevails, but one thing is certain: he always remembers the vow he once made:

“I, Li Shimin, swear to protect Yang Yunyi for life, whether she is a princess or the daughter of a fallen kingdom. I will never break this vow!”