The Daughter of a Prosperous Emperor

She was a princess of the Sui Dynasty. She had a prominent status, but she kept her name anonymous. She changed her appearance and entered the prefect's mansion as a maid. There, she met Wu Meixue, a dancer who looked exactly like her under the mask. Was it a coincidence, or was there another hidden secret? When she stabbed the prefect Li Yuan with a knife in front of all the guests, but failed and was rounded up, by some strange combination of circumstances, she was able to use Wu Meixue's identity to stay in the prefect's mansion and wait for an opportunity to assassinate her. He is the second son of the Li family, handsome and resourceful. He is dedicated to hunting down the assassin, but he doesn't realize that the assassin is always by his side. In the end, it was no longer clear whether they loved each other more or calculated more. The only thing that was certain was that he always remembered the vows he had made! "I, Li Shimin, am willing to protect Yang Yunyi for the rest of her life. No matter she is a princess or a daughter of a subjugated country, I will never break this oath!"