"What do you mean? I have recovered my strength and broken through the space barrier. Can't I go back to the other side? "

Xu Feng is confused.

"haven't you heard a word? It's easy to climb the mountain, but hard to go down the mountain. The power you need to break through the boundary and return to the earth is not the same as the energy you need to return from the earth! "

the old man in the grey robe explained: "that is to say, your current strength can't break the border from the alien world back to the earth!"

"how is it possible?"

Xu Feng didn't believe...