At forty years old, Lee Boo Jeong has lost her way. She feels like she has reached the end of her potential and achieved absolutely nothing. Lee Kang Jae is twenty-seven, a man at the end of his youth, and though "afraid of nothing," feels afraid his life will never amount to anything. "Lost" tells the story of ordinary people walking towards the light who suddenly realize that 'nothing has happened' in the middle of the downhill road of life. It depicts the most ordinary daily life standing on the edge of darkness rather than light, a life where one cannot easily choose. (Source: JTBC, OSEN)