The Northern Heaven Sword Court believes that the purity of star iron determines a sword cultivator's strength. Pei Zhaoxing, a lowly servant, collects fragments of fallen stars and unexpectedly awakens the Myriad-Jin Overlord Physique, uncovering the secret of how the trajectories of starlight guide their paths. Together with Ning Zhixue, an astronomical observer, he challenges the centralized giant-sword approach championed by Murong Duanyue, the foremost sword disciple. When the Seven Nights Star Tide triggers a catastrophic, enormous stellar ring, everyone joins forces to build a distributed star-guidance network, rewriting the Sword Court's outdated system for judging strength.