Knowledge is a central norm of assertion in Korean too.
Turri, J., & Park, Y. (2018). Knowledge and assertion in Korean. Cognitive Science, 42(6), 2060–2080.
Evidence from life science, cognitive science, and philosophy supports the hypothesis that knowledge is a central norm of the human practice of assertion. However, to date, the experimental evidence supporting this hypothesis is limited to American anglophones. If the hypothesis is correct, then such findings will not be limited to one language or culture. Instead, we should find a strong connection between knowledge and assertability across human languages and cultures. To begin testing this prediction, we conducted three experiments on Koreans in Korean. In each case, the findings replicated prior results observed in Americans and were corroborated by key findings from new replication studies on Americans using materials back-translated from Korean. These findings support the theory that there is a core, cross-culturally robust human practice of assertion and that, according to the rules of this practice, assertions should express knowledge.
Armchairs usually don't get such good mileage.
You get bonus points if you act like you care.
Assertion is more closely linked to knowledge than it is to certainty.