Who are the main characters in the story "The Stone Beast in the River"? What are their views on things?

Three people, a scholar, a fortune teller and an old boatman, the scholar said that the stone beast must have been washed downstream by the water, and the fortune teller said that the stone beast was so heavy that it could not move. The old boatman said that the stone beast sank at the bottom of the river and the water passed, but the water in front of the stone beast was slow and the water behind it was urgent, causing a pit and the stone beast would go upstream.