“Undercover” depicts the story of Han Jung Hyun, who has been hiding his identity for a long time, and Choi Yeon Soo, a human rights lawyer who becomes the first head of the Senior Civil Servant Corruption Investigations Unit to fight for justice.

• Ji Jin-hee
• Kim Hyun-joo
• Yeon Woo-jin
• Han Seon-hwa
• Heo Joon-ho
• Jeong Man-sik
• Han Go-eun
• Son Jong-hak