Transmigrating to Great Ming: The Hongwu Emperor Wants to Make Me Imperial Preceptor

He wakes to find himself transmigrated to the Ming dynasty, appointed as an immortal master by Zhu Yuanzhang himself. From the start, he receives a sign-in System. Signing in at Yingtian Prefecture earns him superior potato and corn seeds! Signing in at the imperial palace earns him steelmaking technology! Signing in at the Imperial College earns him advanced printing techniques! Zhu Yuanzhang: “The Immortal Master is truly a divine being! Please accept my bow and become the Imperial Preceptor of my Ming dynasty!” Zhu Di: “Imperial Preceptor, I beg you, please rein in your powers! If things keep developing like this, I’m afraid I won’t get the chance to launch the Jingnan Campaign!” As for me, I only want to sign in in peace, eat my fill, and wait for death. But my abilities won’t let me!