In theory, if the laws of the Mortal Realm truly force the twins to the Divine Realm, then they wouldn't be able to come back anytime soon. Of course, back in Lisan Universe, the twins' group was able to use their own power to resist the Mortal Realm laws and stay there for a month. It's just that the twins' cultivation was much higher back then.
Would Rean, Roan, and Kentucky be able to force themselves to stay in the Mortal World while their cultivation was only in the Void Tempering Realm Initial Stage? They didn't have an answer for that, especially since the laws of this Universe are different. For example, there was no such thing as reincarnation in this Universe.
Karev waited to hear Rean's decision while Rean actually spoke to Roan. 'What do you think?'
Roan didn't even bother thinking, though. 'What is there to talk about? We promised to take Karev away, not his brother. Meaningless risk for someone we barely know.'