Eternal Night Oath

He woke up, and there was a silent explosion in the endless chaos. He drew two rings, expelling the chaos, and there was time and space in the rings. All things are derived from the ring. He selected eight places on the ring, which are responsible for one yang and seven yin respectively. He gave these things rules to make them run smoothly and circulate in cycles. There are 167,000 strings on the ring. The bottom of the ring is divided into four areas, and the ring becomes a world. Life is born among the elements and laws, and the story begins in a corner of this world...