At the age of 20, Qiu Chenfeng was driven down the mountain by his master to fulfill his contract, but his engagement was broken off. Because of his bravery, he was misunderstood by policewoman Liu Yilin and was brought into the criminal police force. He became a temporary non-staff worker by virtue of his master's old friend, and even accidentally moved into Liu Yilin's home. Possessing unique medical and martial arts skills, he repeatedly solved strange cases and defeated powerful enemies, and became famous in the martial arts circles of Sioux City. As they get along day and night, the two develop a three-part agreement and develop feelings for each other, and face the crisis together. In the end, Qiu Chenfeng uncovered the mystery of his life experience, became a full-time member of the criminal police force, and started a new life with Liu Yilin intertwined with responsibility and love.
