The Jeju April 3 Incident refers to an event that took place on Jeju Island from March 1st, 1947, to September 21st, 1954, spanning seven years and seven months. It was a tragic incident where residents of the island were sacrificed during armed conflicts and suppression operations, and is considered one of the largest tragedies in the history of Jeju Island. We look into the significance the Jeju April 3 Incident left in modern history.