I went to a Tae Kwon Do school who states that their style is Mu Duk Kwan. This deeply confuses me, because my old Tang Soo Do school's style was Mu Duk Kwan. This Tae Kwon Do school has all of the same hyungs ( All Gi Cho Hyungs, all Pyung Ahn Hyungs and even Passai) that we practiced at my old Tang Soo Do school as well. How is it possible that two different arts have the same "style"? Thanks!