YMMV / The Battleship Island

• Complete Monster:
  • Yoon Hak-chul is a former Korean resistance fighter who defected to Imperial Japan and became an informant for them on Hashima Island. Gaining the trust of the other Korean laborers, he informs the Japanese guards of any escape plans and manipulates the deaths of numerous escapees, while embezzling their compensation pay and the withheld wages of other laborers. When his treachery is exposed by Park Mook-young, Yoon tries to kill him and later shoots a witness to the scene, Ko Choong-ho. Learning of an imminent Japanese defeat in World War II, he works with Yamada to kill every Korean laborer in exchange for safe passage out of Hashima Island, trying to manipulate every Korean, including the women and children, to enter into the coal mines so that they could be Buried Alive.
  • Shimazaki Daisuke is the manager of Hashima Island, responsible for enslaving the men into working under harsh conditions in the coal mines, where they are often starved and subjected to work accidents that result in their deaths. As for the women, Daisuke converts them into comfort women and sells them into sexual slavery, in which they are beaten and raped by their new husbands. When Daisuke learns of a gas explosion in Mine No. 2, he orders it to be sealed off to prevent further damage to the rest of the complex, even though there are many Korean laborers still stuck in the mine.
  • Yamada is the right-hand man of Shimazaki Daisuke, who enjoys tormenting the Korean laborers under his control, such as drowning two escapees in order to get a higher payment. Realizing that Japan will likely surrender to the United States, Yamada concocts a plan to wipe out all evidence of the war crimes committed on Hashima Island, including the massacre of every Korean laborer, in which he murders Daisuke to usurp his position. Heavily implied to have ordered the murder of a Japanese schoolgirl, he exploits the situation to justify his crackdown on the laborers and has Choi Chil-sung, accused of being the murderer, tortured as punishment. When the Koreans attempt to escape the island, he leads his forces to attack them, ordering his men to kill every Korean, even the ones who are aiding the Japanese.