Tang Shaowen, Zhao's nanny, is a very clever mathematical genius and deeply trusted by Zhao Xiaofeng and Zhao. "Punishment" deliberately linked Tang Shaowen and Xi Guohua through lens switching, and many viewers even suspected or identified Tang Shaowen as a member of Xi Guohua's secret task force.

But then, the real undercover Tao Qiu appeared, which directly ruled out the possibility that Tang Xiao was undercover by Yan Guohua, but enhanced the mystery of Tang Xiao's identity.

In fact, there are many undercover in Zhao's family. In addition to Chang Zheng and the dead Zhao, the Zhao family also has three undercover agents, each with a purpose. Many people suspect that Tang Shaowen is the undercover of the Zhao family. After all, every time Zhao Pengcheng makes a move, he sends a text message.

However, in the new plot, it has been revealed that Tang Shaowen is not the undercover of the police force, but the undercover, so strictly speaking, he is not undercover, and can only be said to be an eyeliner arranged around Zhao.