This Act comes into effect on April 1, 2012; provided, however, that the provisions of the following Article come into effect on the date of promulgation, and the provisions of Article 17 of the Supplementary Provisions come into effect on the date of promulgation of the Act on the Development of Related Acts for the Promotion of Reforms to Enhance Regional Autonomy and Independence (Act No. 105 of 2011) or the date of promulgation of this Act, whichever is later.