High-rank coals are limited, while low-rank coals are abundant. However, the low-rank coals needs upgradation so as to improve their quality. If not, the utilization of low-rank coals will lead to many operational difficulties. As this study was made in South Korea, this article discusses the energy and coal scenario of South Korea. The critique discusses the concerns of utilizing low-grade coal and the need for upgrading low-grade coal. The article also briefly discusses the currently practiced low-rank coal upgradation techniques. Also, the review paper suggests some best upgradation techniques.

I. Introduction
 II. Energy scenario of South Korea
  1. Characteristics of imported low-rank coal of SouthKorea
   1. Drying of coal
   2. Ash reduction of coal
 III. Upgradation techniques of low-rank coal
 IV. Conclusion
 Nomenclature
 Acknowledgement
 References

• Prakash Parthasarathy(Clean Energy Conversion Process Laboratory (CECP), Department of Environmental Engineering, Yonsei University)
• Hang Seok Choi(Clean Energy Conversion Process Laboratory (CECP), Department of Environmental Engineering, Yonsei University) Corresponding author
• Hoon Chae Park(Clean Energy Conversion Process Laboratory (CECP), Department of Environmental Engineering, Yonsei University)
• Jae Gyu Hwang(Clean Energy Conversion Process Laboratory (CECP), Department of Environmental Engineering, Yonsei University)
• Ho Seong Yoo(Clean Energy Conversion Process Laboratory (CECP), Department of Environmental Engineering, Yonsei University)
• Byeong-Kyu Lee(Clean Energy Conversion Process Laboratory (CECP), Department of Environmental Engineering, Yonsei University)