He is the Devil of the underworld. A man who kills without blinking. Whose empire was built on blood, fear, and the kind of respect that never asks twice. She is his greatest rival's deadliest weapon. Sent undercover as an innocent bookstore girl with one clear mission: Get close. Earn his trust. Put a knife through his heart. It should have been simple. Until the Devil notices her. And the Devil does not let go of what he claims as his. Now every stolen glance feels like a warning. Every accidental touch feels deliberate. And the line between hunter and hunted starts to blur. She came to end him. But the Devil has other plans. He doesn't just want her close. He wants her his. Some missions demand sacrifice. This one demands her heart... and everything else she is.