Watch TV Series Undercover (Korean) online for free. Han Jung Hyun is an agent of National Intelligence Service formerly Agency for National Security Planning, who has been hiding his identity for quite sometime. Choi Yeon 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.