Eun-ha, who is a normal junkyard employee, secretly works as a delivery clerk that deals with unusual delivery requests. One day, Eun-ha heads to Seoul to pick up a client who is involved in a gambling crime that wants to flee overseas. However, Eun-ha meets the client's young son at the pick-up point, instead of the client himself. Kyeong-pil, a current police officer who is actually masterminding the whole gambling crime, chases after the missing child who has the security key to the bank account that holds 30 million dollars.

This film tells about the twists and turns of the lives of four lovers who must each overcome different fears and problems as they face the beginning of a new year. The four pairs consist of Ji Ho and Hyo Young, Jae Heon and Jin Ah, Yong Chan and Yao Lin, and Rae Hwan and Oh Wol.

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.