Oh-wol, the train deputy head of the railway constructions and Dong-hoon, a passenger on the Kyeongchun Line meet on a train and did each other a favor. Later, they coincidentally run into each other once again and they eventually fall in love. Oh-wol attends to the Kyeongchun Line which is not far from being closed from Seoul to Chuncheon and she likes Dong-hoon's warmth and consideration but is nervous when he can't
