In the dark corners of the bustling city, there hide unknown sins and mysterious powers. Tessa, a woman diagnosed with Antisocial Personality Disorder since childhood, seems to have her heart consumed by darkness. Lacking emotions, she has an uncontrollable craving for blood and killing.

Since childhood, Tessa has shown distinctive traits. At the age of 5, she demonstrated indifference to others' pain. When witnessing a little boy fall and get hurt, she felt no guilt. Instead, she observed his reaction with great interest. During her growth, she Massacre stray animals, regarding it as a scientific experiment, and showing no mercy for the passing of life. At 18, she almost killed a date who tried to violate her. This incident prompted her grandfather to have her tested, and she was finally diagnosed with Antisocial Personality Disorder.

As she grew older, Tessa's killing desire became even stronger. She became a top assassin for the Albanian mafia, codenamed "Beauty." She was ruthless in her methods, precisely delivering a fatal blow to her targets in every mission. Cutting fingers and torturing criminals were as common as daily routines for her. She enjoyed watching her prey struggle in fear.

Once, while on a mission in an abandoned factory, every move of Tessa was Take in the full view by the mysterious Nero. Nero, a powerful vampire king, possesses extraordinary abilities and an endless lifespan. For decades, he has never felt such a strong desire for anyone. Tessa's elegance and cruelty during the kill, along with the intense bloodlust she exuded, deeply attracted Nero. He watched as Tessa threatened, tortured, and finally killed her target. Every movement of hers fascinated him, even arousing an impulse to possess her.

Nero began to follow Tessa, witnessing her disposing of the body and going to a nightclub for a date. When Tessa was robbed, Nero appeared. He could have easily dealt with the robbers, but he knew Tessa liked this kind of conflict, so he chose to watch quietly from the side. Tessa easily repelled the robbers, and her strength and fearlessness made Nero even more fascinated.

Nero confessed to Tessa that it was her bloodlust that attracted him. He approached Tessa, invaded her personal space, and even daringly tasted her blood. Tessa was shocked by Nero's actions, but deep down, she was driven by an inexplicable desire, and she did not resist Nero's approach.

After that, before leaving, Nero left a mysterious invitation, asking Tessa to invite him into her home. Tessa was caught in confusion and struggle. On one hand, she was curious about Nero; on the other hand, she was uneasy about this unknown emotion and relationship. And Nero, after returning to his territory, was also filled with anticipation for Tessa. He longed to meet her again and completely bring her into his world.

In this world full of danger and temptation, the fates of Tessa and Nero begin to intertwine. One is a human killer driven by dark instincts, and the other is a vampire king with endless power. How will their forbidden love unfold? Can Tessa accept Nero's existence and the mysterious world he represents? How will Nero break down Tessa's inner defenses and make her completely sink? And what impact will their relationship have on each other and the world around them? All the answers are waiting to be revealed in this fantasy - filled and thrilling story. 

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