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In 2000, Ha made her film debut in the thriller, "Truth Game", alongside Ahn Sung-ki, where she was chosen for the role from a pool of 1,500 prospective candidates. For her portrayal of a bipolar character, Ha was awarded Best New Actress at the 37th Grand Bell Awards and 1st Busan Film Critics Awards. The same year, she starred in Ahn Byeong-ki's horror movie "Nightmare", and sci-fi romance film "Ditto", which won her the