The courtyard Shi Lei bought was located in the western suburbs of Yishui City. The houses there were cheap, relatively remote, and very quiet.
In fact, Shi Lei had another reason for buying this house: it was very close to the western city wall, which would make it convenient for him to "leave the city."
In other words, his current residence was not too far from his original slum district, separated only by a giant bluestone city wall.
Chapter 16