Ye Fan safely returned from his ascension, and he wanted to visit everyone around him. Then, he planned to send some girls who had little self-defense ability into the second secret realm.
Currently, Ye Fan had moved his temporary refuge from the first secret realm to the second. Sending the girls there gave him more peace of mind since the second secret realm had a complete void layer of protection, making it inaccessible to ordinary immortals and cultivators.
As for whether the second secret realm was absolutely safe, it was not within Ye Fan's consideration. He just didn't want the women around him to face more danger.
