Born in Gwangju on May 18, 1980, the life of novelist 'Misu' was tragic from the very beginning. The loneliness caused by his father's disappearance on the day of his birth and his mother's lifelong search for him could only be alleviated through writing. One day, while dedicating himself to his work in isolation from the world, he receives a package containing the belongings of a person named 'Lee Seoyeon' from a nursing home. By piecing together fragments of records and memories from a diary and cassette tapes, he confronts the truth of that day...