So-San is the pseudonym of the great monk Choi Hyong Ung (1520-1604) during the Lee Dynasty. The 72 movements refer to his age when he organized a corps of monk soldiers with the assistance of his?pupil Sa Myung Dang. The monk soldiers helped repulse the Japanese pirates who overran most of the Korean peninsula in 1592.
Se-Jong is named after the greatest Korean King, Se-Jong, who invented the Korean alphabet in 1443, and was also a noted meteorologist. The digram represents the king, while the 24 movements refer to the 24 letters of the Korean alphabet.