The Villain Is Assassinated from the Start, Then Threatens the Empress Dowager

[No Toxic Content + Not a Doormat + Decisive and Ruthless + Smart Protagonist + Merciless to Beauties] Long An transmigrates into the current crown prince, and from the start he is nearly killed in an assassination attempt. The mastermind turns out to be the empress dowager herself? The System he gets is actually a Villain System? My dear younger brother, I never would have guessed you were the protagonist. “Your Highness, what about the empress dowager?” “What empress dowager? This crown prince calls the shots in this kingdom. Raise the troops. We rebel.” Long An speaks with soaring confidence.