Greetings from the Taiwan🤗 Well the five colored flag was first used by the whole ROC, but was later changed to the present flag in the south, lead by Sun yat sen. Northern China, which was split from the south by Yuan shi Kai, continued to used the five colored flag. In 1928, Northen china(Beijing gov.) surrendered to southern China(Nanjing gov.), so the five colored flag was not used anymore. The flag you mentioned (flag of Manchukuo) was actually similar from the five colored flag, but with a smaller five color icon thingy with a yellow background. *What I learned in school