The former Southern Bureau of the CPC Central Committee, whose full name is Southern Bureau, was a secret organization established by the Central Committee of the Communist Party of China in Chongqing during the Anti-Japanese War. The Nanfang Bureau, with Zhou Enlai as its secretary, manages the party organizations in Kuomintang-controlled areas, occupied areas and overseas on behalf of the central government. After returning to Yan 'an, Dong, member of the Standing Committee of Nanfang Bureau, took over as secretary. So Dong in the play is Dong.