-Medical Examiner Dr Qin (Theres a hint of possible romance, none though, think its pretty equally focused despite the name)
-Tunnel (more like one ML, but the other dude is there for pretty much everything)
-Save Me (Trio M and 1 girl, AMAZING! Doesn't really fit but... well just watch it)
Haven't watched/dropped but might work: Mystic Nine
Prison Playbook
Life on Mars
The Guest
The Fiery Priest
*So that was actually pretty hard, not much like you were asking- adventure and focusing on two people but the best I could do?? There are a few more crime ones like The Guardians/Player but that's more like a gang of people... dunno hopefully you get something here?? :) x