That's because you use dry rice noodles. The rice noodles in Guilin are famous for their good rice noodles. Only the water in Guilin can make authentic Guilin rice noodles, otherwise it will not be delicious. Moreover, the rice noodles in Guilin are all dry, so you can't add a lot of soup, plus sour pepper, sour beans, braised beef and pot roast. If you pinch it by hand, 15 minutes will be OK.