I have a feeling it's the brother or the police officer just doesn't like him and is doing everything he can to get him arrested(also that he may like fl too). Either way though we don't have much people to point at because there are only two side characters so far bruh so all theories
Im 15 and ive been reading BL since I was 8...(my first manga was this 18+ plus shii I believe at 6 or 7)
-Your dream is delicious
-Night by the sea
-Jinx
-SIGN
-Dear door