I Disguised Myself as the Real Heiress, but My Fiancé Saw Through Me

Shen Wu was orphaned and alone from a young age, until Prince Changshan took her in and trained her to be a blade in his hand. When she was seventeen, she received the final assignment of her life as a secret guard: pose as the long-lost biological daughter of the Marquis of Jining's household and deliberately get close to her nominal fiancé, the young Grand Secretariat Zhou Jing. Zhou Jing seemed graceful and gentlemanly, treating others with warmth, but deep down he was cold and distant. Just as she finally managed to get close to him, she was informed that the real young lady had returned. All she wanted was to finish the mission and gallop away as fast as she could. Who could have guessed that the Grand Secretariat Zhou, who looked like an immortal from a painting, would fall for her? Fake heiress / mutual affection / love and rivalry