‘Soo-ah’ spends hellish days everyday due to dating violence of her live-in boyfriend, ‘Hyun-woo’. ‘Anuat’, a man full of mystery, stays by the side of her. Soo-ah goes on a trip to an island with her only friends ‘Yoon-mi’ and Hyun-woo to celebrate her 25th birthday. On the night of the full moon, Anuat follows the footsteps of Soo-ah and encounters evil spirits surrounding her.

　　一群走投无路并急需金钱的人收到神秘邀请，邀请他们共同加入一场游戏。为了赢取 456 亿韩元的奖金，背景各异的 456 名参赛者被关在秘密场所进行游戏。每一轮游戏都是韩国人小时候会玩的传统游戏，如一二三木头人，但闯关失败的后果是死亡。谁将是最终赢家，这个游戏的目的是什么？