Nine slices of pizza, one poisoned. Nine players must each choose a slice. While everyone else is still afraid, Su Yi devours three slices in one go, laughing as he says, “I'm just hungry.” No one knows that this mystery novelist has already spotted the flaw in the puzzle. Drawn into a bizarre game and assigned the unpopular class of Trickster, he can only use lies to probe for the truth and deduction to expose deception. However, an amnesiac's diary, a gentle lover, and the mysterious person X gradually lead him to discover that his most dangerous opponent may be none other than his own self from yesterday.