Journey to the West and I Became Sun Wukong's Junior Brother

When Li Xuan went out to buy breakfast, he was hit by a battery car that ran a red light. Why did the scene around him completely change when he opened his eyes? He accidentally traveled to the world of Journey to the West and became a disciple of Patriarch Bodhi or Sun Wukong's junior brother? A journey of Li Xuan's cultivation of immortality...