I Can See Experience Points

Before going to sleep, He Xiaotian had only complained that it was boring. But when he woke up, he discovered that the entire world had changed! The screen of light in the upper-left corner of his vision became his only support. “Alright, I can accept all of this. But at the very least, shouldn't you tell me exactly how to get Experience Points?!” ...... — Description from novelcodex.org