Helianshu, a geek who can sense "wrinkles of time", was accidentally accepted as an apprentice by the ancient "Watchmakers' Guild". Holding a "time latitude guide" that is neither gold nor stone, he works with his chatty assistant Pei Jing and his hidden master Zhi Qi in the hidden corner of history to repair the "historical cracks" that may lead to civilizational faults. From the laboratories of the Victorian era to the piles of scrolls in the Dunhuang Grottoes, they peeled off the cocoons, used topology to deconstruct the turbulent flow of time, anchored the nodes with historical textual research, and danced on the edge of "over-revision" and "laissez-faire". Every cautious intervention is the deepest respect and repair of the long river of time.
