I think Silla's Golden Age saw much advancement in astronomy and mathematics, and these were important in their society which had a shade more superstition than we. The astronomical observations and unique star charts made by Silla scientists and the creation of a science center in Gyeongju were not imported from the Chinese. https://www.ancient.eu/amp/1-15320/ Other advancements are detailed here: https://books.google.ch/books?id=GzjpCAAAQBAJ&pg=PA504&lpg=PA504&dq=silla+science+history&source=bl&ots=nHWRAmvQ-K&sig=PVMcZrfw_IFPeN9JeweGez-ZHCA&hl=en&sa=X&ved=2ahUKEwj_2N6dw7rZAhUMuBQKHX5HDXMQ6AEwA3oECAUQAQ#v=onepage&q=silla science history&f=false https://books.google.ch/books?id=9sawofv6lJsC&pg=PR17&lpg=PR17&dq=silla+science+history&source=bl&ots=3r5CrJ1iNM&sig=SvtPJbSKE2aGxX9D_oOdsTD028Q&hl=en&sa=X&ved=2ahUKEwj_2N6dw7rZAhUMuBQKHX5HDXMQ6AEwBHoECAQQAQ#v=onepage&q=silla science history&f=false And your point that Cheomseongdae's purpose is somehow not understood rings hollow. Scholarly consensus is that it was an astronomical observatory and fringe theories as to its purpose (whether from the 1920s or other) that are no longer popular do not support your point in that regard. If anything, the Koreans, as any smart scientist or historian ought, used what was known and developed further to advance their understandings. Simply not being the first to discover or do something doesn't mean you're not innovative or scientific focused. Similarly, I hardly know of anything in the Carolingian Renaissance (or the Renaissance itself as we know if) that didn't come in some form from something earlier, yet that doesn't mean there was a lack of innovation. The brief Golden Age was true of Georgia and Scotland as well, and many other civs, so that's again neither here nor there. Korea as portrayed with all their medieval era bonuses led by medieval scientific leaders Seondeok and Sejong = makes sense for them to be scientific. Frankly Spain's conquest of the New World was also the "exception to the rule" of Spanish history, but here we are with many Spanish Civ designs in Civ revolving around conquistadors, gold and military bonuses with allusions to colonial aspirations. As earlier discussed, my basis for pointing out Korea's bonuses are not historically inaccurate are tied as much to military technology as the Japanese being heavily influenced by Korean printing technology. And by your logic, Japan shouldn't get industrial bonuses given that many of its innovations in the Meiji Restoration period grew from ideas and technology originally made in the West. Innovation and science bonuses aren't always tied to simply being "first". Otherwise only Sumeria and China would get science bonuses.