In the world of 2035, AI engineer Lao Luo is terminally ill. As a single father, the life of his 10-year-old daughter Luo Mengmeng has become a big problem. For this reason, Lao Luo can only hand over the guardianship rights to his home assistant, an AI robot "Tianhao". From then on, how should the AI robot "Tianhao" accompany its ward Luo Mengmeng to grow up?