Modern history class was observed by emperors

History teacher Lin Xiao's unique history lessons lead to various dynasties. Students answer: "How many years after the death of the First Emperor, the imperial capital was attacked by the enemy? A: four years, B: ten years, C: two hundred and ten years, D: thirteen thousand five hundred years." Facing this synchronized sky, Zhu Yuanzhang confidently answered: "Do I need to say more? Four years!" Qin Shihuang broke the defense! Lin Xiao: "Okay, classmates, answer again, how many years after Zhu Yuanzhang died, when the imperial capital was attacked?" Faced with this exact question, Zhu Yuanzhang was dumbfounded! "It will take four years to announce the correct answer to the students!" Zhu Yuanzhang broke his guard: "What? I, the Ming Dynasty, also died in the second generation?"