This is a spy love story. In order to investigate a transnational conspiracy codenamed "Night Project", National Security Police Officer Zhang Qiao recruited clothing model Lin Xiaoyan, the daughter of an old comrade-in-arms, to become an undercover "Nishang". In the crisis-ridden mission, Zhang Qiao's protection for Xiaoyan gradually went beyond his duties and turned into deep love and concern; and Xiaoyan also sublimated her dependence on this steady and reliable guide who was like a teacher and brother to a passionate love. The two protect each other while disguising their identities, adventuring on an isolated island, and experiencing life and death on a cruise ship. Their emotions and missions are deeply intertwined. -On the eve of the final closing, an emotional choice about trust, sacrifice and sincerity unfolds fiercely. In the end, Zhang Qiao and Xiaoyan recognized each other after fighting side by side, and returned to the countryside to achieve success; while Shen Qingle and Wang Ye also completed their emotional growth with understanding and blessings. The four of them guarded the light together on different roads, completing the double transcendence of career and emotion.
