Act for Promotion of Private Participation in Infrastructure Projects Article 20
The use period for the land, of which the ownership or the superficies is expropriated in accordance with Articles 16 and 18 hereof, shall be determined in accordance with the deadline approved for the project concerned. In case the authority in charge fails to use the land in accordance with the deadline approved for the project concerned, the original land owners may, within five (5) years from the day following the expiration of the deadline approved for the project concerned, apply with the relevant municipal or county (city) governments to purchase back the land previously expropriated at the original expropriation price.