The mountains of the wilderness hide thousands of creatures in the "Book of Mountains and Seas". The ancient ancestors entered into a star-orbit symbiosis contract, and later generations divided into two factions: Yuling and Duanling. One thousand years later, twin brothers and sisters of Yin and Yang were born in Wanling. The Yuling clan was afraid of their power and forcibly separated the twins when they were young: the baby girl Aheng abandoned Luowu Village, and the baby boy Xuanshuo stayed with the Duanling clan. The brothers and sisters did not know each other's identities. The two factions have been fighting each other all year round, and their hatred has accumulated and turned into a black mist of death that can only be channeled but cannot be killed. Ah Heng was born with the ability to see evil spirits, and would fall into a spiritual realm in the mist when she was emotionally aroused. Because of her special bloodline, she was considered unlucky by the village. When the village was about to be swallowed up by the black mist, the elder handed over bamboo slips and told Zhaoyao Shanzang the truth about her life experience. In order to find a way out, Ah Heng went into the mountains alone and met Bai Ze, an auspicious beast who was bound by the ancient spirit sealing oath. Bai Ze witnessed the whole process of the separation of the twins and could only reveal clues in fragments. The two teamed up and rescued the healing beast Lu Shu on the way, and met the boy guarding the mountain in Qingqiu. The group traveled through the seven secret realms of mountains and seas, and repeatedly confronted Xuan Shuo, the leader of the Duan Ling, and their bloodline spontaneously resonated every time they met. Xuan Shuo spent his whole life searching for the other half of the Yin and Yang bloodline. The Duanling ethnic group was stratified, and most of the refugees at the bottom were innocent people who were bewitched. During her travels, A-Heng used her spiritual breath to empathize with the living beings, built many symbiotic settlements, and collected fragments of the star-track contract. Along the way, ancient books and stone walls kept throwing fragments of her life experience, until the shocking truth was revealed at the Holy Land of the Ancestors: She was originally from the Duanling lineage, and Xuan Shuo was a twin brother. Ah Heng, who knew her life experience, was unwilling to cling to hatred from any faction, and used empathy to inspire a large number of low-level severed spirits. She united with Xuan Shuo's yin and yang spirit breath to relieve her obsession, and gathered all spirits to gather on the top of the mountain to work together to channel the thousand-year turbid air and recast the star track contract.