The Ruins of Time Echo, and Another Me Appears in the Past?

During the decisive battle with the invading creatures from another world, Yang Ming chose to die with the opponent, but found that he had not completely disappeared. He found that he had returned to the past, and there was also a "Yang Ming" here, but his personality was very different from his own. He had no direct contact with the creatures and objects in this world, but he soon discovered that some of his actions seemed to have a weak impact on reality...