In Huanxing City, Lin Yu and Ye Li, half-siblings who share a father, receive a mysterious invitation to play Werewolf. If they don't go, their secret will be exposed, so they head to an old castle on the outskirts of the city. During the game, they navigate players who each have their own agendas. On the surface, it's a brutal game of Werewolf: someone "dies" every night, and the players engage in heated deductions by day. Beneath the surface, the characters are tangled in emotional conflicts. A sudden New Moon incident causes their identities to switch, sending the situation spiraling out of control. A contest of life and death, intertwined with the search for the truth, begins.
