The Tyrant's Older Sister [Book Transmigration]

A palace coup, a change of emperors. The court is divided into numerous factions, and the political waters are treacherous.

Because she looks strikingly like the late Grand Princess, Xiao Yu is sent into the palace by a mysterious organization to serve as the puppet emperor's substitute elder sister.

When they first meet, the young emperor is upright and innocent, with picturesque features and red lips, white teeth. He warmly and dependently takes her hand and says, "Elder Sister, I have missed you so much."

Xiao Yu answers with a trembling voice, though her palms are slick with cold sweat.

She knows she has entered the world of a novel, and that the puppet emperor before her is the story's villain. Before long, he will grow into a tyrant with ruthless methods who never lets a slight go unpunished.

And after her identity as his fake elder sister is exposed, she will be thrown into the prison dungeons, subjected to forty-nine brutal tortures, and then meet her death.

So on her very first day in the palace, Xiao Yu begins plotting her escape...

Double-agent fake elder sister x scheming villainous tyrant younger brother

Premise: To be added