One of the most senior North Korean officials to ever defect, Mr Park has revealed an ugly truth about the regime he served faithfully for decades.
Mr Park, which is not his real name; he wants his identity hidden for fear of retribution against friends and family still in Pyongyang.
His first allegation is shocking. He claims North Korean leader Kim Jong Un ordered his own aunt, a blood relative, to be poisoned.
“On May 5th or 6th of last year,” says Park. “Kim Jong Un ordered his aunt, Kim Kyong Hui to be killed. Only his bodyguard unit, Unit 974, knew this