Five years ago, soldier Liang Zhiyuan was seriously injured while protecting his comrades. He was forced to retire and lived in seclusion on Hong Kong Island. He became a single father and ran a small sweet shop. He just wants to take his daughter Tangtang to and from school every day, play mahjong with his neighbors, and live an ordinary life. However, the ring on the ring finger of his left hand, made of ancient jade, is actually a fragment of the "causal operation core" left behind by an alien civilization. It allows him to see the chaotic "causal lines" between people and between people and things from the perspective of a "healer". When the four major families in Hong Kong fell into internal strife over a "black lotus fragrance" that could manipulate people's emotions, when elites from various countries gathered in Hong Kong to snatch his daughter's strange jade pendant, and when the real "villain" lurked at the bottom of Hong Kong, brewing a conspiracy that would sacrifice the whole city, Liang Zhiyuan finally realized that peace was pretended and trouble could not be avoided. He decided not to hide anymore, and relied on his iron-blooded skills and a golden finger that understood cause and effect to protect a bowl of hot soup, a small bed, and a city that he redefined as "home".
