五位多年未见的闺密,因为参加其中一人在加勒比海举行的海岛婚礼而再度聚首,闲暇之余,她们决定搭船前往一个无人岛探险,没想到该岛的周围潜藏着饥肠辘辘的鲨鱼,五人必须设法从鲨口逃生……。。Gyeong-ah works as a caregiver and lives alone. The only one she can rely on is her daughter, Yeon-su, but it's hard to see her after she moved out on her own. Meanwhile, Yeon-su, who is suffering from her ex-boyfriend, Sang-hyun, argues with him again and visits her mother’s house. After Yeon-su left, Gyeong-ah receives a shocking message from a stranger.。