Chu Ling, an ordinary urban youth, accidentally picked up a little angel from the silent world - a sign language girl Ya Ya in the noisy Star City Square. The helplessness and stubbornness in her eyes instantly activated the two golden fingers deep in his soul: [Heart Voice Listening System] and [Guardian's Light System]! From then on, he started a hilarious and heart-warming life as a "nanny". With the support of the system, you can learn sign language in half a day, accurately understand Yaya's emotions, and unlock incredible assistance in parenting, legal, social integration, etc. From the initial communication barriers to the heavy pressure of life, from the questioning of the Civil Affairs Bureau to the scheming Ms. Li's seizure of power, Chu Ling relied on system assistance and endless fatherly love to overcome obstacles all the way and protect the little angel meticulously. However, Yaya's life experience is not simply abandoned. The mysterious emblem she spelled out with building blocks actually involved a huge family inheritance dispute and a shocking mystery involving a criminal group! The life safety alarm is sounding, and a greater crisis is quietly approaching. Can Chu Ling protect his little angel, lift the layers of fog, and allow her to truly integrate into the world and find her own happiness? This is not only the growth of a daddy, but also an urban legend about love and courage!