Any secret that was too easily known would be worthless. Zhao Hai had many secrets, the biggest of which was the existence of the realm. He would never let anyone know about the existence of the realm.
The Vermilion Bird space was a hidden space, so people would know about it sooner or later. However, Zhao Hai did not care about letting people know because it would arouse suspicion.
Although the Vermilion Bird space was not as powerful as a space, such a magical weapon was still very powerful. It would attract many people's attention, so Zhao Hai would not easily reveal the Vermilion Bird space.
However, he had to think about the consequences if the Vermilion bird's space was exposed. That was why he needed to keep those otherworldly demons in the Vermilion bird's space.
