In the thirty-seventh year of Hongwu's reign, while carrying out a mission, Embroidered Uniform Guard Shen Tian was ambushed and gravely wounded. He accidentally transmigrated to the modern era and became a prison guard. Drawing on his years of experience as an Embroidered Uniform Guard, Shen Tian solved numerous cold cases. As he continued investigating all kinds of cases, he uncovered a shocking conspiracy, and the truth gradually came to light.