In a dystopian Korea split by a bridge, the cruel rule of the Hwang family condemns the Left Bank to poverty and starvation, while the Right Bank basks in luxury. The heir, Hwang Hyunjin, raised to be a merciless ruler, has always secretly pitied the people's suffering. Everything changes when, during a tax collection round, he meets a boy from the Left Bank named Yongbok—this encounter turns his world upside down and makes him question everything he thought he knew.