Transfer student Liu Ruyan pretended to be a poor student to cheat for donations, and the whole class unexpectedly heard her voice, with the exception of Zhang Yi. Everyone saw through her plot, secretly collected evidence, and repeatedly thwarted her frame-up. As the investigation deepened, it was discovered that Liu Ruyan was a pawn of the fraud gang and was controlled by "Sister Hong" behind him. In the end, the whole class set up a bureau, teamed up with the media and the police to expose the gang's cheating and fraud, Liu Ruyan was arrested, and everyone graduated successfully and started a new life.
