Traveling Through the Future: Black and White

In the dark night and the humid alley, Qin Xin didn't know how long he had been lying down before he finally woke up and tried to stand up. The pain coming from his body made him give up, "Let's lie down for a while!" Is what the black robe said true? Can the transmission key take me back to my previous life? Where is Tianan Continent? Is it far from here? Why does Tianan Continent sound like a martial arts world... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.