Lin Yu accidentally enters a mysterious dungeon world. He navigates between true and false information in an ancient castle identity game, then solves layers of puzzles in a second question-and-answer dungeon. Later, he enters the Winter Mountains, investigates the truth behind Charte, and faces even more complicated rules and human hearts in the Heavenly Feast above. The four dungeons continuously escalate, and Lin Yu relies on observation, reasoning ability, and quick judgment to find ways to break through, gradually approaching the greater secret hidden behind this mysterious game.