Elegant, refined, loyal; everything a royal is expected of. Princess Lena Malfeen expresses what she needs to as the youngest princess of her kingdom, Rotédia. However, a naturally cold and enchanting aura hints at the second side of her. Clever, skillful, and secretive, the 22-year-old princess has a reticent job as an assassin by the name Silk Eyes. Now, she's widely recognized for her skills within the joint organization of assassins and spies. Lena's curiosity starts when she is asked to teach a few trainees with one of the top spies. She doesn't know much about him but once he starts to show interest in her, Lena is intrigued. Maybe because of his uniquely handsome features that captivates everyone or his impressive skills, Lena can't forget him. As the two grow closer and uncover each other's personality, an inevitable force brings them together. Through the earthquakes of life and the peaceful rivers, Lena feels she's found a rare person.