Tie Jia, a leader of ancient secret guards, time-travels overnight to become a debt-ridden, down-and-out dad, and must protect his five-year-old daughter Lu Mianmian, who has been reborn with off-the-charts intelligence. The father-daughter duo navigates the modern metropolis, delivering food and running errands to pay off old debts while fighting crises lurking in the shadows. Accidentally meeting the powerhouse career woman Li Yan, the three get entangled in layer after layer of conspiracies, and the destiny of their past lives quietly reboots.