From what I remember you get a scene or conversation like Guizang where he tries to read the scroll but can't read it as well.
I thought it was basic knowledge and some people knew about it seems I discovered something rare without been aware all these years, I discover it over a decade ago in the dreamcast EU version, so I don't remember exact details.
Are you playing on Shenmue I & II or from the emulator?
As well in English or Japanese? if you can share save file, I would like to give it a try.
Another surprising fact is that most people that played Shenmue II didn't know that martial arts schools existed in Kowloon.
You can barely find videos or picture of the place.
The reason, why Ryo ask him, is because notice the school named tiger and he a master of a tiger style. This is why he didn't ask other martial artists. I would have liked if Ryo showed other people in the game the scroll but that doesn't happen.