Back in my days they used to call this a BL

Koogi confirms that Sangwoo and Bum are a canon couple. She knows they are the main attraction, which is evident in the official artwork of them being lewd/cute/possesive with each other. KS is a BL, but this doesn't detract from its seriousness, as its main plot is known to be a police thriller, psychological horror, and body horror.