As a result of a traffic accident involving a violation of the centerline, the perpetrator dies, and the victim falls into a coma. After some time, the wife of the perpetrator, Heejoo, returns. Heejoo is bewildered at the fact that the victim’s wife Youngnam is also working at the factory where she goes to work. By accident, Heejoo becomes close with Youngnam’s daughter Eunyoung and learns a new fact about the incident. The true nature of this accident, where Heejoo’s husband was known to have crossed over the centerline, is actually very complicated. Since the social issues of dispatched labor and industrial accidents and personal issues of depression and family trouble are intertwined here, it is more difficult to apprehend.
A collision occurs between two cars on a busy road. One man dies, the other goes into a coma. An investigation into the crash concludes that the dead man was at fault. Racked with guilt, the dead man's widow Hee-ju struggles to move on with her life. But when she discovers that the man in a coma had tried to kill himself before the accident occurred, she begins to suspect that he might have have caused the crash on purpose and her husband was innocent after all. She starts to reinvestigate the events.