How to Fail an Exam
The life and military of Yi Sun-sin is extremely fascinating. This series from Extra History is a very interesting overview of him.
Statue of Admiral Yi Sun-sin in Seoul
Daimyo Konishi Yukinaga, who led the Japanese armies that overran Korea and captured Seoul and Pyongyang. He was also Catholic, surprising as that may seem. This invasion took place in the short period when Jesuit missionaries were able to operate in Japan, before the Tokugawa Shogunate expelled all missionaries and banned Christianity in Japan.