I once saw a TV clip where they challenged viewers to tell the difference between per-province election results and the response to Sejong's tax system at the b

I once saw a TV clip where they challenged viewers to tell the difference between per-province election results and the response to Sejong's tax system at the beginnings of the Joseon dynasty -- they both had the same GSD/JLD split. Unfortunately I can't find it now though; it was very insightful.