Geum Ryong, once a troublemaker and accident-prone, dedicates himself to his studies after three years of marriage, thanks to the devoted support of his wife Yeon Hwa, and that year he brilliantly passes the imperial examination as the top scorer. Geum Ryong is the youngest to pass the exam! The king is greatly pleased. Geum Ryong bravely expresses his convictions even before the king, impressing the monarch and his ministers. When asked about his study secret, he tells the king that his success was entirely thanks to his wife. As Geum Ryong prepares to embark on a long journey, Yeon Hwa suddenly appears disguised as a man and insists on accompanying him. Despite her family's dissuasion, she remains steadfast, so she is finally allowed to join. As soon as the couple steps out of their home, three of Geum Ryong's friends, ready for the journey, appear. Thus, five people set out together on a secret inspection mission (amhaeng). Heuk Soo, the bodyguard sent by the king, follows them like a shadow from a distance to protect them. On the king's orders, they hide their identity as royal inspectors (eosa-tto) and travel around the country like wanderers, solving cases that arise and punishing corrupt officials who oppress the common people to create a just society. This is the mission of Kung Dor-ryeong and his friends! Until the day all the people of this land can live without injustice and prosper, Inspector Kung Dor-ryeong will keep running!