- Pocheon Facilities Management Corporation
- Seoul Metropolitan Facilities Management Corporation
- Korea Industrial Complex Corporation
- Korea Hydro & Nuclear Power Co., Ltd.
- Government Employees Pension Service
- Korea Asset Management Corporation
- Teachers Pension
- Pohang City
- Dalseo Gu Office
- Korea South-East Power Co., Ltd.
- Daegu Metropolitan City
- Korea Gas Safety Corporation
- Changwon City
- Korea Consumer Agency
- GumiCity
- Province of Gyeongsangbuk-do
- Small and Medium Business Administration
- SiHeung City Facilities Management Corporation
- Energy Management Corporation
- Suseong district
- Changwon Facility Management Corporation
- GANGNAM-GU OFFICE
- Namgu Office
- Gyeongsangnam-do Office of Education
- Ulsan Metropolitan Facilities Management Corporation
- Gyeonggi-do Medical Center
- Korea Creative Content Agency
- Namyangjoo City
- Busan Infrastructure Corporation
- Korea Fisheries Resources Management Corporation
- Gimhae City
- Korea Internet & Security Agency
- Korea Midland Power Co., Ltd.
- Korea Western Power Co., Ltd.
- The Province of GYEONGJU city
- Agency for Defense Development
- National Health Insurance
- CheongjuCity
- Korea National Oil Corporation
- YEONG GWANG County
- Cheongju Facilities Management Corporation
- Korea Power Exchange
- Korea Rural Community Corporation
- Korea East-West Power Co., Ltd.
- Marine Environment Management Corporation
- Arts Council Korea
- Korea Rail Network Authority
- Daejeon Metropolitan City
- Korea Local Finance Association
- Ulleung County
- Korea Sports Promotion Foundation
- Seoul Metro
- National Information Society Agency
- DangjinCity
- MinistryofAgricultureFoodand Rural Affairs
- Korea Student Aid Foundation
- Korea Technology and Information Promotion Agency for SMEs
- Korail Retail
- Buyeo County
- National Pension Service
- Credit Guarantee Fund
- Korea Labor Force Development Institute for the aged
- National Federation of Fisheries Cooperatives
- Busan Port Authority
- gijang County
- Sacheon City
- Korea Forestry promotion Institute
- Saha-gu Ofiice
- Ulsan Port Authority
- Meritz Financial Group
- Seoul Metropolitan Fire & Disaster Headquarters
- Korea Power Engineering
- The Small & medium Business Corporation
- Korea Petroleum Quality & Distribution Authority
- Korea Youth Work Agency
- The Korean Teachers' Credit Union
- The-K JEJU Hotel
- The-K Hotel & Resort
- The-K Savings Bank
- The-K Sophia Green
- The-K Third Age
- The-K Yedaham
- The-K Teachiworld
- Korea Appraisal Board
- Small Business Market Corporation
- Chungcheongbuk Election Commission
- Korea Electric Power Corporation
- Kyobo Securities
- Hadong County
- Cultural Heritage Administration of korea
- Korea Sports Industry Development Co., Ltd.
- Defense Agency for Technology and Quality
- EnvironmentalcorporationofGwangju
- Incheon Development & Tourism corporation
- Gijang City Menagement Corporation
- Korea Land & Housing Corporation
- Republic of Korea Ministry of National Defense
- Jeollanam-do Province
- Korea Food Research Institute
- Korea Institute for Advancement of Technology
- DAEGU NATIONAL SCIENCE MUSEUM
- Namseoul nonghyup
- Korea Meteorological administration
- Health Insurance Review & Assessment Service
- KoreaLivestockPruductsHACCPAccreditationService
- Korean Register of Shipping