According to Wikipedia, Lv Chang is a fictional character in the TV series Zhu Yuanzhang, and his prototype is Zhang Chang, a political figure in the late Yuan and early Ming Dynasties. Zhang Chang used to be a minister in the Yuan Dynasty, who was good at managing money. Later, he was recruited by Zhu Yuanzhang, appointed as the province of Zhongshu in the Ming Dynasty, and participated in the discussion of state affairs. Missing his hometown and relatives, Zhang Chang wrote a private letter to Yuan officials in the north, which was discovered and reported by yang xian, and was finally executed by Zhu Yuanzhang.