Arriving before Li Chang Hu's home, Di Tou suddenly realised there was an issue. In regards to Li Chang Hu… he really didn't know how to prove his identity. After all, although Sister Jue had given him a pass, she also hadn't really gone out of the way to give him a way to prove his identity, and as such, he had had to face the difficult issue of 'proving' himself each time.
In Thousand Li Stroke, he still had a few secrets and methods he could mention to prove what had occurred, but with Li Chang Yin and Li Chang Hu, the stories he had to tell mainly had to do with what had happened in the Academy, and although there were plenty of shared stories, for the most part they were all things that had happened in public, either in a lecture, or in an open area. In theory, any student from the Academy in that era could tell the same stories if they so wished.
