The original store sounds impressive, and although I'm not very familiar with the stories or connections, I often see the different combinations of the numbers five, seven, and nine in the names of various beef noodle shops, which makes me quite curious. The environment is just average; during meal times, it's very busy, so it can get crowded and you may need to share tables, but the food comes out quite quickly.
The braised beef noodles with a mix of tendon and meat had a flavorful broth, the tendon was soft and chewy, and the beef was tender, while the noodles were good too. Adding self-serve chili and pickled cabbage gave it a unique flavor. The chili oil noodles were also just right in taste. Overall, it was pretty good. I'd like to try the marinated dishes next time; they looked delicious as well.