A sudden downpour traps thirteen strangers who have never met in a remote mountain villa. The owner has mysteriously vanished, leaving behind only a strange note: "Welcome to the game. Only one person will leave alive."
As time passes, one bizarre thing after another occurs: every hour, someone dies under mysterious circumstances, and a playing card is always left at the scene, counting down from A to K as if marking time until something. Fear spreads through the group, trust begins to crumble, and anyone could be the killer or the next victim.
Detective Chen Mo stumbles into the villa while investigating an old case and is forced into this deadly game. He must decipher the code behind the playing cards before time runs out, uncover the villa owner's true identity, and reveal the connection between this "game" and an unsolved case from ten years ago...
