The Secret World of Og is a children's adventure about 4 children who venture into an underground cavern beneath their playhouse to look for their lost baby brother. There, they discover a land of little green people who are enamored by the world above but won't allow anyone to leave their cavern for fear they might "tell".
By depicting the dreams of people living in farming villages, this drama also reveals problems that today’s residents of rural areas face, such as a growing number of biracial children from international marriages and the cutthroat competition to survive.