This book tells the story of three siblings, with an average age of 49, who reunite under their mother's wings after 20 years as they fail to form a new family.

The story begins with a man in his 50s who is saved by his mother after wallowing for a decade as a playboy on Chungmu-ro following the failure of his debut feature film. Unable to revitalize his life, he jumps back into his mother's arms. Much to his surprise, the man finds at his mother's home his older brother, who has become a jobless bum after blowing his deceased father's life insurance benefits on a failed business. He also finds his younger sister accompanied by her daughter, who has recently been divorced by her second husband after being unfaithful. He is deeply saddened to discover that not one member of the family is doing well. Then, one day, the man discovers hidden truths about his family: His brother is his half-brother and has a different mother, and his sister is his half-sister and has a different father.

새로운 가족을 만드는 데 실패하고 20여 년 만에 다시 엄마 품으로 모인, 평균 나이 사십구 세 삼 남매의 좌충우돌 생존기. 데뷔 영화가 실패하면서 10여 년간 '충무로 한량'으로 지내온 50대 남자인 나를 엄마가 구원해주면서 이야기는 출발한다. 회생불능의 상황에 부닥친 나는 당장 엄마에게로 뛰어든다. 하지만 그곳에는 교통사고로 돌아가신 아버지의 보상금으로 사업을 하다가 다 날려 먹고 백수가 되어버린 형, 바람을 피우다 두 번째 남편에게 이혼을 당하고 딸 '민경'까지 데리고 들어온 여동생 '미연'이 있었다. 나는 우리 가족 중에 멀쩡한 사람이 없음에 탄식한다. 그러던 어느 날 나는 내가 형과는 이복형제고 여동생과는 이부남매라는 등 우리 가족의 숨겨진 이야기를 밝혀내게 되는데…….