The play concentrated on the exploits of the communist underground activities under Japanese occupation in 1939, though history traces back in the 1920s. When Li Yuhe, a railroad worker who was engaging in underground work, was taken away by special agents and Grandma Li has a premonition of being arrested, Grandma tells the protagonist, Li Tiemei the true story about her family. Grandma Li tells Li Tiemei how her parents have sacrificed their lives in the revolutionary struggle. Li Yuhe has taken up the unfulfilled task of the martyrs. After hearing the heroic story about her family, Li Tiemei is determined to follow the example of her father and carry the revolution through to the end.

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