Zhao Han, a simple young man with a gentle and jade-like appearance, is actually the top killer "Night Owl" hidden in the shadows of the city. In order to complete his last task - to protect a three-year-old girl Xiaotuanzi, he was forced to disguise himself as a single dad and live in the most upscale villa area in Beijing. However, this seemingly ordinary task made him involved in a power storm that swept through China's top circles.
Xiaotuanzi's true identity is the only blood heir to the Qin family, the largest conglomerate in China. Her disappearance has triggered the covetousness of many forces. Zhao Han had to deal with Xiaotuanzi's crying and the parent-teacher meeting in kindergarten, while at the same time he had to face the pursuit of killers from all walks of life and the calculations of powerful people. He confuses everyone with his gentleness and "simpleness", but secretly uproots all his enemies with thunderous means.
From the "poor yogurt dad" who was ridiculed by the upper class, to the reclusive strongman who was wooed by the four major aristocratic families; from the single father who was embarrassed by the kindergarten teacher, to the sharp sword of the country that had the military boss personally come to thank him. Zhao Han proved with his strength that no one can offend this nanny!
But as he gets closer to the truth, he discovers that there is a shocking secret behind Xiao Tuanzi's life experience that can overturn the entire power structure of China. And the "simplicity" he is proud of is about to face its greatest test...
