Although Gu Yaya, the fourth young lady of the Gu family, is congenitally mute, she possesses the ability to sense danger, and her inner voice is heard by her three older brothers. Yaya's warnings allow her elder brothers to see through the hypocrisy of the adopted daughter Lin Qi, for which Lin Qi plans a series of interlocking conspiracies including poisoning, framing, secretly filming videos, and stealing commercial secrets. The four brothers and sisters lure the enemy with false news, ultimately locking down the evidence of Lin Qi's crimes, causing her to be taken away by the police, bringing the Gu family back from the brink of danger, and causing their parents to wake up as well.