The Great Ming's Unorthodox Grand Tutor, Whom Zhu Yuanzhang Deeply Respected

He transmigrates to the first year of the Hongwu era with a modern shopping mall System and happens to meet Zhu Yuanzhang. Thinking he has found a big customer, he prepares to make a fortune. But Old Zhu only picks out items the mall doesn't stock: strategies for ruling a country. Luckily, his surname is Zhu and he's a transmigrator, not an ordinary one. He has at least a little learning in his head. Even so, Old Zhu still refuses to play by the rules. He gives him a grand mansion, and he ends up owing Old Zhu 40,000 taels; He gives him 300 Silla maids, and he ends up owing Old Zhu 100,000 taels; He makes him Grand Preceptor, and he ends up owing Old Zhu 200,000 taels.