Lin Chen was once an ordinary librarian, intensely rational and highly attuned to logic and detail. After encountering an insoluble predicament in real life, he received an anonymous invitation marked “High-Difficulty Puzzle Challenge.” He clicked on it and was pulled into the game. He isn’t a bleeding heart and prioritizes his own survival. He’s open to cooperating, but always stays on guard. Skilled at exploiting information gaps and psychological tactics, he has an instinctive feel for “loopholes in the rules.” When faced with a sacrifice, he calculates whether it’s “worth the cost,” and in extreme circumstances, he can accept “necessary evil.”