Prisoner in Yao Yue's Dream

Mo Yao is an ordinary student in high school who accidentally enters the fantasy dream. The fantasy dream is a test that determines whether he can survive. With the help of his guide, Sa Yue, he passed one test after another and carved out a world of his own in the fantasy dream. However, Sa Yue often looked at him with evasive eyes. Is the fantasy an assessment or a dream?