Killing Stalking: Deluxe Edition Vol. 8 by Koogi

Seungbae has hit rock bottom - but things get a lot worse when he receives a phone call informing him of Chief Kwak's suicide. Seungbae isn't convinced that Kwak killed himself, though. In fact, he's pretty sure he knows who did kill Kwak. Fueled by anger and grief, Seungbae sets out to put Sangwoo behind bars once and for all.
Binding: Paperback / softback