Humans are the spirits of all things, and gu are the true essence of heaven and earth. This is a story of a time traveler being reborn again and again. It is a peculiar world of raising, refining, and using gu. Spring Autumn Cicada Gu, Moonlight Gu, Wine Worm Gu, Golden Light Worm Gu of Unified Qi, Green Silk Gu, Hope Gu... The majestic mountains and long roads are as firm as iron, yet now we start anew. With the essence of heaven and earth within my sole body, my heart still looks up to the sky