On the surface, Lin Feng is a math teacher at Feng Tang International High School. In reality, he is a former special forces elite known by the codename “Wind and Cloud.” When his former comrade-in-arms “Raindrop” is brutally murdered, a USB drive containing top-secret information lands in his hands, and cracks suddenly appear in the quiet routine of campus life. On one side are his students’ youthful laughter and the warm gaze of his colleague Liu Shishi. On the other are suspicions of a traitor within the organization and deadly threats lurking in the shadows. Lin Feng must tread carefully between his two identities, pursue the bloody truth amid the sound of lessons, and protect the mission left unfinished.
