While investigating an arms trafficking case under an assumed identity, young marshal Xiao Heng rescues Murong Xue, who is being pursued by Battalion Commander Chen. Five years later, Murong Xue returns with her daughter, Ranran, to find her father, and the two reunite. While concealing his identity to continue investigating the case, Xiao Heng protects his wife and daughter, exposes Battalion Commander Chen's arms smuggling and the Murong family's conspiracy. Eventually, his true identity is revealed, the villains are brought to justice, and he reunites with Murong Xue and Ranran in marriage.