The Tale of Yanlan: The Tyrant's Favorite Consort

Transmigrated as the adopted daughter sent by the Empress Dowager of the Xifeng Kingdom to marry into another land, Murong Yanlan somehow ends up in the Crown Prince's residence instead. All she wants is to be a quiet little spy and stay alive in this era, but the Crown Prince keeps provoking and tormenting her. He is composed and cold-blooded; she is arrogant and outspoken about love and hate. He makes her the envy of the world, showering her with all his favor, then condemns her to a life before the Buddha and watches her raise her head to drink the poisoned wine. If I've already given you my heart, how can I leave you? If the ending has already been written, how can I believe in destiny? (A little angst, but with a happy ending.)