String theory is a correct mathematical theory. It is not a physical theory because it has not been verified, but if it is verified in the future, it will change from mathematics to physical theory. All physical theories in history are based on mathematics, and the appearance of string theory provides a mathematical basis for us to find the correct physical theory in the future. From this point of view, I think string theory is correct in the end. Just as classical physics opened the door to the physical world for modern physics. For us, no matter what the final theory is, we should understand this string theory now, because it may be a door to the right path.