Baek Chan Mi is a legendary agent for the National Intelligence Service. However, due to an excessive operation, one of her subordinates passes away. After this incident, she takes back all hope of returning to the field when she gets an order to go undercover. She begins working as a secretary for Ilkwang Hitech under the name, Baek Jang Mi. She is joined by a single mother, Im Ye Eun, who has
