As long as they retain some semblance of rationality, no inhabitant of the Ancient Ruins Space would entertain the thought of returning to the Main Plane. Usually, when they are indeed intending to return, it often signifies that the force occupying their Ancient Ruins Space is preparing to fully integrate into the Main Plane.
Without any extraordinary circumstances, no group would willingly abandon their independence. Therefore, under such conditions, it wouldn't be incorrect to believe that Zhou Tian would be safe once he returned to the Main Plane.
But just when Zhou Tian assumed that the Corpse Dragon couldn't deter him, and that he could easily escape back to the Main Plane, the force acting against him shattered his delusions instantly.