Go to Hell Your Majesty/Shuttling Through Time: Turning Dark Starting Today

Lin Feng, a modern commoner, uses a portal to help Empress Zhengyang conquer the world. After her victory, she betrays him. He breaks ties with her, taking back his modern supplies and inadvertently trapping himself in the past. He then allies with Empress Lin Xuan to wage war against his former lover, Zhengyang, who now faces the collapse of her empire.