
A middle school student with maturity and intelligence beyond her age. Suk-kyu/Jeong-hyeon and Yeon-soo younger daughter. He has an obsession with bicycles, therefore he helps his father operate their bicycle repair shop. Suk-kyu/Jeong-hyeon and Yeon-soo's autistic older son. Supporting Family of Han Jeong-hyeon and Choi Yeon-soo Heo Joon-ho as Im Hyeong-rak, director at the National Intelligence Service.Jung Man-sik as Do Yeong-geol, Han Jeong-hyeon's former senior at the National Intelligence Service, formerly Agency for National Security Planning.However due to this promotion, her husband is tasked to stop her. Years later, because of her consistency in defending Hwang Jung-ho, she is promoted as the Corruption Investigation Office for High-Ranking Officials by the government.

Both of them were ended in mutual love, without her knowing who Suk-kyu was, therefore getting married with him. In one of a chaotic protest against the government, she met Lee Suk-kyu, under pseudonym of Han Jung-hyun. She joined a mass protest with Kim Tae-yeol, Kang Choong-mo and others to protest against the corrupted South Korean government who failed in protecting Hwang Jung-ho's innocence. A righteous person, she consistently seeks justice for years to Hwang Jung-ho for 20 years after he was unjustly being jailed. She passed her bar test at the age of 20. Years later, he lives a peaceful life with his family until one day an NIS agent named Do Yeong-geol comes back to his life and he is enlisted to take down his own wife, Choi Yeon-soo.Ī human right lawyer for more than 20 years. At first he was tasked to spy on Choi Yeon-soo under pseudonym of Han Jung-hyun in order to take down Kim Tae-yeol who was targeted by NIS, eventually both of them were in mutual love and got married. He was selected as the new agent of NIS when he was in a police academy. Lee Seok-kyu is agent at the National Intelligence Service, formerly the Agency for National Security Planning. Yeon Woo-jin as young Han Jeong-hyeon/Lee Suk-kyu.Ji Jin-hee as Han Jeong-hyeon/Lee Suk-kyu.
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The series tests their relationship as husband and wife when the secret life of Jeong-hyeon comes to light. These characters are trying to uncover the truth, pitted against a huge force holding a top position. Choi Yeon-soo ( Kim Hyun-joo), his wife and a Human Rights lawyer, becomes the first Director of the Corruption Investigation Office (CIO). Han Jeong-hyeon ( Ji Jin-hee) is an agent of the National Intelligence Service (formerly the Agency for National Security Planning), who has been hiding his identity for the past 30 years as a father and owner of bicycle repairing shop. It is its own best ratings achieved during its run. The series ended on Jwith viewer ratings of 5.2% nationwide and 6.1% in the metropolitan Seoul area. Kim Hyun-joo and Ji Jin-hee previously starred together in Miss Kim's Million Dollar Quest (2004) and I Have a Lover (2015). The series is also available on streaming media TVING in South Korea.


It aired on JTBC on Fridays and Saturdays at 23:00 ( KST) from April 23 to June 12, 2021. Based on BBC drama series of the same name, it portrays the story of Han Jeong-hyeon (Ji Jin-hee), an agent at the National Intelligence Service, and a Human Rights lawyer, Choi Yeon-soo (Kim Hyun-joo). Undercover ( Korean: 언더커버 RR: Eondeokeobeo) 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.
