Mr. Seng Thang is currently in Ratanakiri province. During the Sangkum Reastr Niyum, his parents farmed and hunted for subsistence. He did not study deeply because of his away school and the coup in the Lon Nol era. In 1977, the Khmer Rouge appointed him as a mobile physician in the cooperative. The Khmer Rouge also taught him how to make, to boil and to mold medicine. He was also arranged by the Khmer Rouge to marry. After a week of living together, the Khmer Rouge separated the two back to their works.