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The book is called "Horseshoe·Golden Years: Northern and Southern Kingdoms" Horse Shoe Jin was pushed into the water. He thought he was going to die, but unexpectedly he came back to life in another world. The world he lives in is divided between the north and the south, and the two dynasties are of the same lineage but are opposed to each other. The northern country is poorer, but it takes on the important task of resisting the cavalry in the northern region, and the people's livelihood is very difficult; the south is rich, and it is very happy to sing poems and compose rhymes.