Admiral Lee Sun-shin designs and builds the 'Turtle Ships' in preparation of the Japanese invasion during the Injin War. He is promoted after his victories, but due to his expanding influence and increased popularity in military circles, the king comes to fear him and has him imprisoned. A year later, the Japanese navy attempts another invasion and the king is required to enter the prison and beg the admiral's assistance.
Unfortunately the movie A War Diary is not yet available on HBO Max.
| Production | Han Gap-jin | Producer |
| Directing | Jang Il-ho | Director |
| Camera | Seo Jeong-min | Director of Photography |
| Writing | Na Han-bong | Screenplay |
| Editing | Ree Kyoung-ja | Editor |
| Sound | Jeong Min-seob | Original Music Composer |
