Interpol Xia Qiming returns to his hometown and reopens his father's old case from twenty years ago. Faced with numerous fogs and complex interest entanglements, he adhered to his belief in the rule of law and peeled off the cocoons to find the truth. With the help of his comrades, he not only cleared his father's name, but also protected the peace and justice of the people, interpreting the mission of the people's police.