Mo Tae Goo, portrayed by Kim Jae-wook in “Voice” (Season 1), is a dual-natured character. By day, he is the charismatic CEO of Sungwoon Express; by night, he is a psychopathic serial killer who enjoys torturing and murdering his victims. He exhibits classic psychopathic traits, including a lack of empathy and manipulative tendencies. Highly intelligent and cunning, Tae Goo often outsmarts those trying to catch him. His charm allows him to manipulate others, hiding his true nature. His troubled past and inherent psychopathy make him a chilling and memorable villain.