Lin Yu accidentally transmigrates to a parallel world overrun by creatures from another realm. After a one-night encounter with Professor Su Yue, he discovers that he has a three-year-old daughter, Lin Yueyue. Once he awakens the Star River Mystery Box Shop System, he uses randomly obtained treasures, from cultivation techniques to technological blueprints, to launch a mystery box business. Starting out with no customers, the shop soon becomes famous thanks to a smart learning device. Lin Yu protects the city with an armor summoner and grows stronger through mysterious techniques. However, Mo Yan, who is secretly collaborating with creatures from another realm, is working to sabotage him, while members of his own organization doubt him. Su Yue's concern turns to affection as Lin Yu writes a passionate legend while protecting his family, facing crises, and running his mystery box shop.
