The story takes place in the immortal universe where color and time are intertwined. The protagonist, Yu Liangyi, is actually an elderly observer of the "Star Weaver Civilization". He was ordered to disguise himself as an 83-year-old mortal, use the high-tech "Simultaneous Daoyi" to simulate elixir fire, and sneak into this world to study it. In a border town in the "gray wasteland", he "first met Dan Huo" in his later years. However, due to an accident, the "Jade Disc Pattern of Creation" was activated in his body, and he truly embarked on the road to cultivating immortality. He met Su Wanzhao, a young alchemist who firmly believed that "man can conquer nature" and was involved in a confrontation with the "Destiny Weaver" and his followers. While using the "Time Replay Mirror" to try to correct a tragedy, he accidentally created a new personality clone "Yu Nishi" from the "changed past", which became his most contradictory enemy. As Yu Liangyi advanced in alchemy, he was gradually assimilated by the philosophy and emotions of this world, and changed from an indifferent observer to an affectionate participant. In the end, at the boundary between "the source of time" and "absolute darkness", he used his lifelong cultivation of alchemy as a guide to reconcile all "time faults". He was not pursuing personal detachment, but trying to weave a prototype of a "utopia" for the entire world of cultivation without the shackles of fate and where all things could progress harmoniously. He himself turned into an eternal "rainbow of time" to protect this dream.
