Doubt (Korean: 이토록 친밀한 배신자) is a 2024 South Korean psychological thriller crime drama television series written by Han Ah-young, directed by Song Yeon-hwa, and starring Han Suk-kyu and Chae Won-bin along with Han Ye-ri, Roh Jae-won, Yoon Kyung-ho, and Oh Yeon-soo. The series depicts the dilemma faced by South Korea's best profiler when he discovers his daughter's secret related to a murder crime. It aired on MBC TV from October 11, to November 15, 2024, every Friday and Saturday at 21:50 (KST). It is also available for streaming on Wavve and Coupang Play in South Korea, and on Netflix and Kocowa in selected regions.