Gender roles switch in what sense? I am curious - what are your thoughts?
The one I see is: In-a breaking the glass ceiling and being on top of her game

I think you'll notice it in every little thing. Like that one time where he tripped because of an incoming car (I'm not sure about the episode number) and she caught him by the waist. And in recent episodes when he is being tossed around between USA and SK offices, and then he gets stabbed while she deals with the guy who kinda caused all this. And then when she carries his luggage from the hospital after he asks her to discharge him. And the overall theme that she's emotionally restrained and intense, while he is very turbulent and bubbly. These are all traditionally female executed activities and roles.