The story takes place at the end of the fictional Dayin Dynasty - a declining fairy dynasty that superficially inherited the etiquette of the Tang and Song Dynasties, but in fact alchemists interfered in politics and evil spirits lurked. When Wu Woodcutter, a young woodcutter, was cutting firewood in Qingming Mountain, he split open a thousand-year-old lightning-struck wood and swallowed the dragon-marked bone beads. He awakened the bloodline of the ancient thunder god and could induce the nine-day tribulation thunder and refine the thunder power. He entered the path of spiritual cultivation with a mortal body, and grew up from a thunder hand protecting the village to the powerful "Lei General" in the northern border, leading his army to defeat the Beidi cavalry. However, he was tracked down by a secret edict at the Marquis Ceremony, and his life was finally revealed: his biological parents were hidden alchemists who were framed and executed by the Taiwei Mansion. The main plot revolves around the four-fold spiral of "refining thunder and proving the truth, identifying murder cases, liquidating powerful traitors, and redefining the laws of heaven".
