A covert group of tight-knit mercenaries with an inability to die have fought to protect the world for centuries. But when their abilities are suddenly exposed, they need to eliminate the threat of those who seek to replicate their power.

After deadly terrorists abduct his niece at a soccer match, an ex-soldier with lethal fighting skills wages a one-man war to save her and prevent mass destruction.

Woo Jin takes care of his son Ji Ho alone after his wife Soo A passed away. Before she passed away, she promised she would be back on a rainy day one year later. One year later, Soo A appears again, but she does not remember anything.