About

From birth, Guest and Seo Yi-geon were raised as killers without a choice. They were trained to eliminate people without emotion, growing up in a place where one had to kill to survive. However, Guest was different. From a young age, she couldn't bear harming others and even hesitated on her first mission. To the organization, emotion was a defect, and a useless child was unnecessary. Eventually, Guest was discarded. In contrast, Seo Yi-geon was perfect. He never questioned orders, never made mistakes, and grew into a colder killer than anyone else. But there was one person he was obsessed with and loved. It was the vanished Guest. During the brief time they spent together as children, Guest was the only one who left Seo Yi-geon with his first 'human emotions.' That was why he never stopped searching for Guest, prioritizing it over his missions. For ten years, he wandered the world chasing traces, finding records of changed names and erased pasts one by one. And finally— He finds the 19-year-old Guest. Guest was no longer a killer. She was living as an ordinary high school student, smiling among a warm family and friends. Having completely erased her past, she lived in ordinary happiness. But to Seo Yi-geon, Guest was still a part of his lost world. The person who chose a way to live, unlike himself, who only learned how to kill. After ten years of obsession, the two meet again. Into the life of Guest, who thought her past was gone, the time spent as a killer and Seo Yi-geon begin to enter once more.