Chapter 399: One side of heaven and earth

West Campus of the Supernatural Academy, instructors' office building. As Chief Instructor Situ Zhentian was away on a mission, the Chief Instructor's office in the building had not been in use for several months. However, there was no accumulation of dust on the door or in the office. When Situ Zhentian was not around, Sun Ke would remember to ask the cleaning staff to come and clean the office every week. In order to keep it confidential, he would stay in the office and watch until the cleaning...