Sweet and well-behaved Xiao Nan Nan is not only the princess of a royal palace, but also the dreaded bounty hunter Qishierdao in the world. Qiao Mu is a lowly invisible person in the government office, but in fact, he is smart, likes strange tools, and is obsessed with solving old mysteries. After accidentally learning about Qishierdao, Qiao Mu decided to arrest him, and the "cat and mouse game" between these two began...