As the Cold Sun Catastrophe strikes, its icy light freezes everything in its path. Lu Changqing, the third master of the Lu family, has spent years pretending to be a good-for-nothing who knows nothing about cultivation and can only guard the Solar Tower. In truth, he possesses a special system that returns ten times his cultivation whenever his descendants grow stronger. When his son makes a breakthrough, Lu Changqing gains the power to refine the Azure Lotus Earth Core Flame, turning the deadly Cold Sun into nourishment for cultivation. With the Lu family patriarch seriously injured, the Liu and Li families take advantage of the situation to bully the Lu family. Lu Changqing transforms into a black-robed beheading demon, secretly eliminating enemies, seizing towers, and refining pills to strengthen his clan. When forces from the inner city attempt to seize their towers and a horde of Snow Demons descends, the Lu family reveals all its hidden trump cards. Led by Lu Changqing, the family overcomes every crisis and takes control of Subei.