Ahn had been unconscious in the intensive care unit at Soonchunhyang University Hospital for about a week after collapsing at home last Wednesday due to choking on food and being taken to the hospital in cardiac arrest.
He had been receiving treatment for blood cancer since 2019.
Ahn made his debut in 1957 with director Kim Ki-young's "Twilight Train" when he was just a five-year-old boy and went on to appear in more than 150 films over a career spanning roughly 60 years, becoming one of the country's most beloved stars.
The diligent actor earned widespread admiration for his dedication and versatility across various genres, achieving both critical acclaim and commercial success throughout his career.
Despite his battle with the illness, the seasoned star never abandoned his passion for acting, vowing on several occasions to return to the screen.
His magement agency Artist Company said in a statement later in the day, "Ahn, who had a deep sense of sincerity and dedication, had been part of the history of South Korean cinema and popular culture," adding that he gave comfort and resonated with audiences across generations.
His memorial altar was set up at Seoul St. Mary's Hospital in southern Seoul with a funeral service scheduled for Friday, before he will be laid to rest at a cemetery in Yangpyeong, Gyeonggi Province.
He is survived by his wife and two sons.
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