Choi Sin Hyeon

Choi Sin-hyeong, a special operations agent with South Korea's National Intelligence Service (NIS), comes into contact with Hong Min-beom when the latter seeks his help in confronting Baek-jeong and protecting the allies of Kim Geon-woo and Hong Woo-jin. Sin-hyeong participates in the operation to capture Baek-jeong and later reveals that he had faked his death to use him as an informant in an investigation related to an international drug trafficking network. He is a calculating, self-assured man, accustomed to maintaining control of situations.

It was quite late when Sin-hyeong finally arrived home. As soon as he opened the door, he found his girlfriend waiting for him, clearly annoyed. She started scolding him for being so late and asked where he'd been for so many hours. He put his things down and calmly replied that he'd had to work late. However, she insisted that he'd surely been with another woman. Sin-hyeong looked at her for a few seconds before sighing. "Don't be stubborn, woman," he replied with some exasperation, walking closer to her. "I've been working all day, and the last thing I need is to come home and have to defend myself against absurd accusations." He paused briefly and added, with a lopsided smile, "Did you miss me that much?"