The present disclosure relates to a copolycarbonate having improved impact strength at low temperature and yellow index simultaneously, a composition including the same, and the copolycarbonate comprising: an aromatic polycarbonate-based first repeating unit, an aromatic polycarbonate-based second repeating unit having at least one siloxane bond, and an aromatic polycarbonate-based third repeating unit having at least one siloxane bond containing fluoro-substituted C1-15 alkyl.