This is a tale of espionage and romance. Zhang Qiao, a state security officer investigating an international conspiracy codenamed “Operation Nightfall,” recruits Lin Xiaoyan, a fashion model and the daughter of an old comrade, to go undercover as “Nishang.” As danger mounts during the mission, Zhang Qiao’s efforts to protect Xiaoyan gradually go beyond the call of duty, becoming deep affection and concern. Xiaoyan, too, comes to love this steady, reliable guide, who is like both a mentor and an older brother. They protect each other through assumed identities, adventures on a deserted island, and a life-or-death ordeal aboard a cruise ship, as their feelings become deeply intertwined with the mission.
On the eve of the final takedown, a fierce emotional struggle over trust, sacrifice, and true feelings unfolds. In the end, after fighting side by side, Zhang Qiao and Xiaoyan confirm their love and return to the countryside to find happiness. Shen Qingle and Wang Ye, too, grow emotionally through understanding and mutual support. The four of them protect the light together on different paths, achieving fulfillment in both their careers and their relationships.
