Shu Lan, the chief instructor of District 21 of the Gray Iron Delta, had top-secret files stolen by Lu Jinhan during his shift. She shot Lu Jinhan in the chest, but he escaped. In order to find files, Shu Lan went to Lancheng in Huaguo and successfully approached Lu Jinhan, but was suspected by him. During the confrontation between the two, Lu Jinhan discovered Shu Lan's multiple identities and past, while Shu Lan uncovered the secrets hidden in the files. From hostility to joining hands, they work together to fight against the conspiracy and protect justice. In the crisis-ridden contest, Shu Lan and Lu Jinhan gradually understood each other, and their emotions quietly grew.
