Watch Free Online HD Moviesjoy. The staff of "The Admiral: Roaring Currents", the biggest film of all time at the South-Korean box office, has assembled once again for a documentary. Critically acclaimed director KIM Han-min and his team delves into the actual background, prelude, and preparations of Admiral YI Sun-sin in 1597 and how the admiral’s battle plans have won him his most remarkable victory throughout his career.