Love Me If You Dare (2015)

Both Sociopaths/Psychopaths who are wholly analytical, callous and cold. Both are leading in their field and are considered geniuses.
One is a Medical Procedure show the other Crime Procedure show, buth have an aspect of romance and both shows are little hidden gems that don't show very often as recommendations.

Both dramas have sort of the same theme where Huo Wallace is the main lead and is a genius Detective, only this one is in a 1920s historical setting