But he truly made his mark in 2014 when he released what was the year 's most controversial documentary '' The Truth Shall Not Sink with Sewol '' ( 2014 ) , drawing criticisms from the government when it premiered at the 19th Busan International Film Festival and kicked off a massive debate about censorship in Korea . The film is a journalistic account of the Sewol ferry disaster – using audio recordings , news clips and interviews – to convincingly assert that the government were grossly negligent in their recovery efforts , which claimed the lives of over 300 people earlier that year . It won Grand Prize at the Fukuoka Asian Film Festival in 2015
19th Busan International Film Festival
19th Busan International Film Festival
Ahn Hae-ryong