On April 1, 1597 (lunar calendar), Admiral Yi Sun-sin walked out of Euigeumbu—the royal tribunal prison in Hansung—after 28 days of severe interrogation and physical torture. Deprived of his military rank and ordered to serve as a common soldier ( Baek-ui-jong-gun ), he picked up his brush that evening and recorded his daily entry in Nanjung Ilgi (War Diary of Admiral Yi Sun-sin). The opening character of that historical entry was simply "晴" (Clear) . Visit the Yi Sun-sin: The Admiral YouTube Channel → Table of Contents 1. From Supreme Naval Commander to Royal Prisoner (Early 1597) 2. The Release on April 1, 1597, and the Sentence of Baek-ui-jong-gun 3. Historical Context: Chronology of the 1597 Crisis 4. Strategic and Philosophical Analysis of the Character '晴 (Clear)' 5. Modern Leadership Lessons from Admiral Yi's Resilience 6. Frequently Asked Questions (FAQ) 7. Summary & Historical Heri...