Twenty years ago, Lin Wanqing, the wife of Shen Hongyuan, head of the Shen Group, was framed and pushed off a cliff. Her newborn son was taken away by a loyal servant, leaving behind only half of a Pixiu jade pendant. Twenty years later, the young Su Chen descends the mountain with the pendant to find his father, disguising himself as a bodyguard for the Shen family to go undercover. While pretending to be foolish and harmless, he secretly gathers evidence of the villains poisoning people and plotting to seize the family fortune, working with his father behind the scenes to fight back. Just as the enemies are about to face justice, Su Chen successfully rescues his biological mother, who has been imprisoned for twenty years. But his mother produces a secret letter that reveals a long-buried case involving the previous generation of the Shen family, with an unknown mastermind lurking behind it all. How will they face this new threat?