Undercover is a 2021 South Korean television series directed by Song Hyun-wook and starring Ji Jin-hee, Kim Hyun-joo, Jung Man-sik, and Heo Joon-ho. Based on BBC drama series of the same name, it portrays the story of Han Jeong-hyeon, an agent at the National Intelligence Service, and a Human Rights lawyer, Choi Yeon-soo. It aired on JTBC on Fridays and Saturdays at 23:00 from April 23 to June 12, 2021. The series is also available on streaming media TVING in South Korea. Kim Hyun-joo and Ji Jin-hee previously starred together in Miss Kim's Million Dollar Quest and I Have a Lover.
The series ended on June 12, 2021 with viewer ratings of 5.2% nationwide and 6.1% in the metropolitan Seoul area. It is its own best ratings achieved during its run.