Let me recommend you a few novels about transmigration kings. The first one is "Unlucky Time Travel: Kings, Don't Block the Way." It mainly tells the story of a transmigrator who works hard to complete his mission, but is disturbed by two kings. In addition, there was also The Evil Prince's Tyrannical Love: Concubines Don't Have Pleasure. It was a story about a United Nations agent who became the fiancée of a cruel prince after transmigrating. She gradually adapted to ancient life under the prince's favor. I hope you like my recommendation. Muah ~