After Lin Xun, a history student and top gaming streamer, completes the full-clear run of the holographic game Nine Realms, the game's core entity, the World Will, forcibly pulls him into the game world. Armed with a complete walkthrough, he plans to rely on his foreknowledge to clear the game and return home, while saving Su Yu and Zhong Yu and teaming up with the powerful Chen Xiao. However, the storyline keeps deviating from the predetermined script, rendering his original walkthrough completely useless. Behind the scenes, the powerful Su Cheng conceals his ambitions and manipulates everyone through sinister schemes. Through repeated battles in dangerous instances and desperate brushes with death, Lin Xun and his companions break free from the predetermined storyline and discover that the world is merely a cruel experiment designed to observe human nature. In the end, they forge a real ending of their own, one that no one has ever written.