Bodyguard Lu Yi (Ren Jialun) is assigned to investigate a case of embezzlement of funds for river repair in Yangzhou. He accidentally receives help from Yuan Jinxia (Tan Songyun), a female constable from Liushanmen. This causes the two of them to become involved in an unexpected case. However, their shared ideals lead them to begin to have feelings for each other. However, fate plays a cruel joke on her, causing her to learn the truth that the man she loves is involved in the death of her family. Love thus turns into revenge. The country must be protected, but gratitude and revenge cannot be neglected. How will the final conclusion be?