In terms of Romance ....
Both have equal amount of romantic scenes...
Ones office and work and the other about fantasy and time travelling.
Its both enjoyable... law of love has a guy who doesn't believe in love and in queens Hyun's... the guy is clueless about ,what love is in the future.
Both the females are believers of romance and love.
Dating agencies. Matchmakers falling in love. The Undateables is more comedic while Murphy's Law has more angst.
Both fall into the Office Romance category, but both also feature the "boss" figures having to overcome some sort of trauma that affects them throughout both series. Also, features the male leads falling for the ladies first and chasing them.
Both are really enjoyable and light taiwanese dramas. Besides, Both have that same kind of plot:unpleasent guy meets sweet girl and slowly starts to change. Both have characters that had their heart broken in the past. The theme office romance is one more thing in common.
Both are about a divorce lawyer and a matchmaker. Their office's are opposite one another. The ML falls in love first. They get together to matchmake divorced and lonely couples.