I Became a Sage by Eating Books

Ning An traveled through time, and when he woke up, he found that not only had his gender been changed, but he was also bound to a strange system. In order not to be obliterated by the system, Ning An could only accept the tasks assigned by the system. From then on, Ning'an not only had to farm and do business, but also had to face the bloody storm in the court...