Shen Yi, the "ceiling" in the world of charlatans, deceives all the best in the world with just one mouth. This time, he received an outrageous mission: posing as the second young master of the wealthy Shen family who had been missing for fifteen years, sneaking into the top families in the imperial capital and stealing a confidential document hidden in the ancestral home. Shen Yi originally thought it was an easy scam, playing the role of a dandy young man, cheating on people with food and drinks, and stealing documents and leaving. Unexpectedly, as soon as he entered the Shen family, he met Lin Wan'er, the "hypocritical best friend" - the caring friend of the eldest daughter of the Shen family. She was gentle and virtuous on the surface, but secretly dug holes for him. Lin Wan'er sensed something fishy somewhere, and while pretending to help him integrate into the family, she secretly spread rumors that he was a fake. What's even more outrageous is that Shen Yi accidentally activated the "Lie Come True System" - as long as he lies big enough and outrageous enough, he can temporarily gain corresponding abilities, but every lie will cause random "social side effects". So, while Shen Yi relied on "I am the reincarnation of the God of Thunder" to summon lightning to kill his opponent, he was tricked by the system into dancing on a pole in public. Under the series of calculations by his best friend, can he keep his identity and complete the mission? As the investigation deepened, Shen Yi discovered that Lin Wan'er was not as simple as she appeared...