: The film explores "borderline legal" investigation methods and the pursuit of justice through deception. Cast & Production Leading Stars : The movie stars Ju Ji-hoon as Ji Hyun-soo, Park Sung-woong as the antagonist Kwon Do-hoon, and Choi Sung-eun as the elite prosecutor Kim Hwa-jin. Casting Trivia : The role of the prosecutor was originally offered to Han So-hee