Engineering My Way to the Throne (DUBBED)

Isaac Litt, a engineering enthusiast from the modern day, wakes up inside the body of a mocked son born to a concubine in an ancient dynasty. At his coming-of-age ceremony he picks a barren mountain as his fief and takes as wives three women whom everyone else avoids. Armed with knowledge from his own era, he sets out to change his harsh circumstances and push through every hardship. Meanwhile, rivals plot against him at every turn, and Isaac must rise from a despised son into a figure of real power.