The underground casinos knew him only as "The Viper" - Hwang Hyunjin, heir to the Black Lotus crime syndicate. His reputation for ruthless efficiency in eliminating rival factions was matched only by his striking beauty that disguised the cold-blooded killer beneath.

That fateful night at the Blood Moon Gala, organized by his enemies to broker an uneasy truce, he saw her for the first time. Dressed in crimson silk that matched the stains his men left on the streets, she moved through the crowd with effortless grace while her brother - Hyunjin's mortal enemy - kept watchful eyes on all who approached.

"Who's that?" Hyunjin asked his right-hand man, never taking his eyes off her. "That's the boss's little sister. Off-limits, Hyung. You know the rules." The moment their eyes met across the crowded room, the air itself seemed to still. Neither looked away, caught in a silent challenge that sent electricity crackling through Hyunjin's veins. In that moment, he knew all the rules no longer applied.