The Princess's Emergency Husband

Aiden Qin meets Princess Isabelle. Quentin forces marriage. Isabelle recruits Aiden as Prince Consort, Constable at Six Doors. Aiden binds with [Empress Assistance System], defeats Northern Yan spy and Roderick Linden. Becomes Duke of National Defense, Grand Marshal, breaks through Terrestrial Immortal Realm. Aiden uses "Myriad Swords Return" to defeat Northern Yan army, quells Quentin's rebellion, helps Isabelle ascend throne, becomes Peerless King. Perfect ending.