Luna Carter, an undercover journalist working as a news anchor, once shot gang leader Kai Reed dead at the US-Mexico border and thought the cross-border criminal case was over, yet three months later in New York, she is shocked to find Kai alive as the heir of the powerful Reed Group; aware of her secret identity, Kai takes her boyfriend Ethan hostage and forces her to hunt down a mole within his criminal circle, and trapped in brutal power fights between the Reed and White clans, Luna later discovers she and Kai shared an intimate childhood bond that she lost due to amnesia, repeatedly attempting to kill Kai to break free until Ethan is severely hurt shielding her, driving a desperate Luna to stab Kai before she gets confined by him, while torn between lingering childhood affection and deep hatred, Kai keeps chasing and restraining Luna, locking the two in an endless deadly emotional game.