How can a novel be copied?

If the names of the characters are just the same, it is not plagiarism. If the plot is exactly the same and the number of chapters is the same, then it is plagiarism. If it is similar but not intentional, it depends on the reader's evaluation. If it is not plagiarism, you only need to explain it, but it depends on whether the reader believes it or not. If the plot plagiarism is serious, the original author comes to the door, indicating that plagiarism is serious!