Rescue: Beginning Sign in a Magical Novel

This is the world a few decades from now Suddenly one day, a door appeared in the sky And this door seems to be indestructible and has extremely strong defensive capabilities. Only Long Xian can travel between the two worlds invisibly by relying on his abilities that he doesn't know where he got them from. He risked his life and came to this different world to learn and progress. Let's see if he can turn the tide with his efforts This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.