Well, its "incense" not "insense".
You should include Timber for ships and siegecraft. Ships should include the kobukson and similar. Also, you could have gunpowder in the late game.
The time period of the Korean Three Periods is much too early for gunpowder and turtle ships. Information on pre-Koryo and pre-Choson ships is sparse. There is one class of large ocean-going ship in this period though - the kyongtangson ("China-going vessel"). These were based on Chinese junk ships of this period and were sent on diplomatic missions to China.
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