>>213692811
Actual answer: Taiwan was the crown jewel of Japanese colonialism. It was their first actual colony and started developing it with the utmost care and paternalistic humanitarian fervour, similarly to the first phase of the colonization of Korea, their only other actual, proper colony. Japanese rule stretched from 1895 to 1945, giving ample time for the newly settled culture to stick and truly influence the way of life. Also, unlike Joseon which as incredibly backwards as it was, had an established culture and proud identity, Taiwan was itself already a mishmash of Qing-era Han settlers and aborigines.
Korea retained bits and parts here and there, even in the language today. But meaningfully, they demolished almost all buildings erected by the Japanese. In Taiwan, you can still see them, and even the presidential palace is still a colonial building.
In Taiwan there were definitely episodes of friction and violence, but the Japanese left a mainly good memory of their rule there. They lived according to Japanese customs with tatami in their homes and all, and you can still find old people who speak the language.
From that, it's not a stretch to posit that the current Taiwanese psyche and way of conducting themselves is at least partly deeply influenced by Japanese culture in peacetime day-to-day living, given that they share a similar characterization by those who visit them to this day.