Every living being possesses a dual spiritual core (Hwaejeong - 화정, 和精), composed of two forces:
Ilgi (solar Ying energy): Cultivators who awaken this spiritual energy are known as:Sun Cultivator: 태양의 수련자 - 太陽의 修鍊者.
Wolgi (lunar Yang energy): Cultivators who awaken this spiritual energy are known as:Moon Cultivator: 달의 수련자 - 月의 修鍊者.
*There are also cultivators who master both spiritual forces. They are known as:Master of Cultivation: 대수련자 - 大修鍊者.