 North Korea was also alleged to have used Macau as a base for planning the 1983 Rangoon bombing, an assassination attempt on South Korean President Chun Doo-hwan, in which 21 people were killed, but the vice-president of Zokwang Trading, Kim Chol Jun, denied allegations of espionage.Kim Hyon-hui, one of the agents who carried out the bombing of 1987 Korean Air Flight 858, claimed to have spent several months training at Zokwang Trading's office while living in Macau.In her autobiography, "The Tears of My Soul", she wrote that, while living there, she learned Cantonese so that she and other North Korean agents could pose as local Chinese residents.