Ming Dynasty: The poisonous imperial teacher, Zhu Yuanzhang advised me to be kind

Chu Nan traveled through time to the Hongwu period and became a minor official in the Ming Dynasty.
He thought he would live in disgrace for the rest of his life in the Ming Dynasty, but unexpectedly, he reached the peak of his life because of his repeated vicious schemes to Zhu Yuanzhang.
Zhu Yuanzhang: "There are too many corrupt officials. What should the court do if it has no money?"
Chu Nan: "First, we should employ corrupt officials and lure them into corruption, fatten them up and then slaughter them, and then put all their assets into the national treasury."
Zhu Yuanzhang was shocked: "What if the northern grassland people often harass the border?"
Chu Nan: "You can throw the bodies of corrupt officials into the grassland people's water source. After the grassland people drink it, they will have healthy bodies."
Zhu Yuanzhang was stunned: "What should we do if the Japanese pirates often harass the coast of Ming Dynasty?"
Chu Nan: "We can threaten the lives of many corrupt officials and their families, and ask them to carry 50 kilograms of explosives each to detonate the volcano of the Japanese pirates."
Zhu Yuanzhang was annoyed: "Your scheme is too vicious, but you have made many great contributions, so I will make you the Imperial Teacher of the Ming Dynasty."
But the ministers were puzzled as to why he could be the emperor's teacher at such a young age?
Zhu Yuanzhang: "Because he is kind."