When I Opened My Eyes, I Became Dasan's Slave

A civil service exam student of N years wakes up to find himself a slave in the Joseon Dynasty! The hand that once held a highlighter now wields a broom. Not a king, a general, a kisaeng, or a wealthy man, but of all things, a slave? Sigh, is this life ruined too? Wait, what if my master is Dasan Jeong Yak-yong? And what if I'm a student who never once dozed off during history class? A redundant human transforms into the cheat key that will change the fate of Joseon! "Brother Mija, Silhak is all well and good, but let's start by learning English first!