South Korea politics is crazy.
Of the 9 elected Presidents they had:
Roh Tae-woo: Convicted in August 1996 for treason, mutiny, and corruption
Kim Young-sam: Arrested two former Presidents and gave one a death sentence and the other 22 years
Kim Dae-jung: Pardoned the two former Presidents (who had previously sentenced him to death)
Roh Moo-hyun: Suspected of bribery by prosecutors, and the subsequent investigations led to him Roh committing suicide on 23 May 2009 when he jumped from a mountain cliff behind his home.
Lee Myung-bak: On 22 March 2018, Lee was arrested on charges of bribery, embezzlement, and tax evasion alleged to have occurred during his presidency. Lee was convicted on 5 October 2018 and sentenced to 15 years in prison.
Park Geun-hye: On 17 April 2017, Park was formally charged with abuse of power, bribery, coercion and leaking government secrets. On 6 April 2018, a three-judge panel of the Central District Court in Seoul sentenced Park to 24 years in prison and a fine of ₩18 billion ($16,798,683), finding her guilty of 16 out of 18 charges brought before her.
Moon Jae-in: Nothing too dramatic
Yoon Suk Yeol: Declared martial law for no reason, probably going to end up in prison like most of his predecessors.