Mellow in May

Oh-wol, the train deputy head of railway construction and Dong-hoon, a passenger on the Kyeongchun Line meet on a train and do 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 be reached for no reason.