The Strongest Gamer in the Fantasy World

Mo Xuan, a boy from the earth, accidentally traveled to the "Fantasy World of Heaven", Here, when everyone turns 18, a watch will appear on their left arm; this is a 'career watch', from which everyone can draw their own career, and of course there are twin careers; once the career is fixed, it cannot be changed; after being drawn, you will enter a game Rubik's Cube called "The Fantasy World"...