Arthur, the true white gorilla heir, is swapped at birth, dyed black and abandoned in slums. The fake heir Leo lives in luxury yet grows cruel. As they grow up, the kind and brave Arthur shows great responsibility amid crises and falls in love with Vivian, a rabbit noble lady. The swap secret is uncovered. Arthur reclaims his identity, defeats Leo’s plot, abolishes class privileges, builds an equal new town and lives happily with his beloved.