A plot to kill Kim Il Sung ended in mutiny and murder (2018)

The bizarre and deadly events that unfolded on the island of Silmido were covered up until details were revealed by a South Korean Defense Ministry Truth Commission in 2006. Yang was a 21-year old volunteer in the air force when he was deployed to the island of Silmido off the western coast of South Korea in 1970. The Defense Ministry Truth Commission report and Yang, the Unit 684 survivor, both insist criminals were not members of the organization.

Source: edition.cnn.com