Lin Yanci, on the surface, is an idle illegitimate son of a wealthy family, but in fact he is an undercover agent lurking in the Lin family. He is responsible for investigating old family cases and uncovering the mastermind behind the scenes. He is sinister, forbearing, thoughtful, and has everyone under his control with his extraordinary psychological insight. The golden finger is "psychological empathy", which can accurately capture the emotional fluctuations of others and see through lies and disguises. Liu Yuru, the evil stepmother of the Lin family, looks gentle and virtuous on the surface, but is actually ruthless. She not only murders the protagonist's biological mother, but also covets the Lin family's property and secretly colludes with outsiders. She is the biggest obstacle to Lin Yanci's undercover journey. In order to complete the task, Lin Yanci pretended to be obedient and started a thrilling psychological game with Liu Yuru, using her greed and suspicion to lay out step by step plans to collect evidence of her crime. In the process, he relied on his sinister nature and golden fingers to resolve Liu Yuru's repeated difficulties and frame-ups, make allies, and reveal the shocking secrets hidden in the Lin family. Finally, he successfully completed the undercover mission, ruined Liu Yuru's reputation, paid the due price, and sought justice for himself and his biological mother.
