The Courtyard Became Bigger and Bigger as It Was Built, and the More the Prince Taught Him, the More Obedient He Became.

Once he traveled through the Ming Dynasty, Du Ruhai became a sick man suffering from mental illness and his engagement was broken off. Accidentally awakened the [Infrastructure System], started to renovate a small dilapidated courtyard, and actually attracted the prince to come to be his apprentice! Du Ruhai paved a stone road - the system rewarded him with the imperial examination question bank; Du Ruhai digs a swimming pool - the system rewards him with lost military skills! So Du Ruhai was engaged in cement while others were in the imperial examination, and Du Ruhai was driving express delivery in the power struggle. Others banned Du Ruhai from teaching the prince to fight Japanese pirates, while others corrupted him and taught the prince to rectify the salt policy. In the end, the small courtyard became the incubator of Daming Technology! Zhu Houzhao: "Master, should we build railways or build aircraft carriers next?" Du Ruhai: "Don't worry, let me build a hot spring in the backyard first."