兩年前的一場意外，讓孝真失去她摯愛的丈夫。32歲的她還沒走出喪偶之痛，老天又交給她一項難題--她必須照顧老公與前妻生下的兒子鐘旭--正值叛逆期的16歲青少年。孝真嘗試打開心房與鐘旭相處，但鐘旭不領情，他跟著好友四處遊蕩，直到發現…

One day, three siblings receive a postcard from their mother who left them a long time ago. But all it says is I miss you. Three siblings are disconcerted by the sudden contact, but eventually, they go on a trip to meet …

韩国演员裴宗玉、李源根及池允浩出演的影片，影片《换季》主要讲述一位母亲得知儿子与朋友之间的秘密后，三人之间的故事。演员裴宗玉将在影片中饰演母亲美婧，池允浩将饰演儿子秀贤，李源根则饰演秀贤的朋友勇俊