Love in the Courtyard: Sign in to Break the Situation, Enemy Agents Reveal Themselves

Era background: Spring 1965 - Winter 1978 (covering the third-line construction, special period, going to the mountains and countryside, resumption of college entrance examination, early stage of reform and opening up) Protagonist: Lin Weidong (20 years old, apprentice in a steel rolling mill, his parents died in a factory accident, with a tolerant personality, after activating the sign-in system, he gradually became wise and courageous, and stuck to the bottom line)