What is Undercover about (plot, summary)
Han Jung Hyun is an agent of National Intelligence Service, who has been hiding his identity for quite sometime. Choi Yun Soo, a human rights lawyer, becomes the first head of the agency for justice. These main leading characters of the series uncover the truth, pitted against a huge force holding top position. The series tests their relationship as husband and wife when the secret life of Jung Hyun comes to fore.