After her divorce with her rich husband, Joong Eun makes a living by working at factories late at night and concealing industrial accidents. Joong Eun’s previous co-worker, Il Sun, runs into Joong Eun at Sungrak Industry while investigating the scene, and asks her to join UDC, Undiagnosed Disease Center. Meanwhile, Joong Eun rejects Il Sun’s offer. (Source: Kocowa)