Widower Han Jong-woo, along with his 20-year-old son Geu-ru, who has Asperger's syndrome, runs a cleaning company called "On the Way to Heaven." They take great care to honor their clients' memories and collect important belongings for their families. However, Jong-woo suddenly passes away due to heart failure, and his will transfers the custody of Geu-ru to his younger brother, Jo Sang-gu, who has just been released from prison. To become the full-fledged guardian, Sang-gu must behave well for three months, live in the apartment with his nephew, and manage the family business.