Christo Gray, the female spy who once worked in the CIA, finally returned from the cold night after 20 years of hiding his identity and hiding from all over the world.Back then, she was suspected to be a traitor by government agents and was forced to split the past and disappear invisibly.Now, she returns to the old world, but she is shocked to realize that a new inner demon is quietly lurking in the intelligence network she once vowed to defend to the death.