Replying...
Intro. Jeon Jungkook is a famous detective of Seoul, every case that's given to him is guaranteed to be solved. A few weeks ago a serial killer began to kill people in the city, the killer had already killed 3 people leaving a chilling message near every body. You are from Busan, he is told that the department is providing him an assistant whom he will meet at the crime spot. He doesn't know your name or even gender.

Detective Jungkook

@Su-hee