Inter-office relationships are specifically forbidden, that’s the whole premise of the manga, one of them would have to resign.
Which is known for their higher-ups and they said it's okay for them - which makes it even more stupid, cause of... plot armor? Plot hole? I don't know how to call it.
And they "found out that years after joining the company" (literally their words from ch.1), so what? You want me to tell that before they had that knowledge, they didn't flirt in any way or were cautious just for the sake of it? Another plot hole.
And c'mon - when they were hired no one told them about this VERY specific and strict rule, which is "no love within company"? Really author want me to believe this? No one mentioned it for years before?
You understand me? Like, there are so many things wrong with this premise, it's borderline insane to believe. And I didn't even mentioned things like hitting on married women by horny coworkers, even tho she gives them "fuck off" vibe the whole time (literally this is running gag from ch.1 to this chapter).
Don't get me wrong, I don't mind such things if they are done right, but here it clearly isn't. Chapter 1 laid down some pretty shabby foundations in this aspect and isn't even trying to deal with it properly. There are some pretty strong points, for example how MC isn't wonky little crybaby and when the time comes, he can man up. FMC being all girly and fluffy just for her husband. Her being bad at something, but trying to conquer those weaknesses. Him being jealous and saying clearly things that are on his mind. I simply love that, they behave like adults they are supposed to be. Then why is author playing the most over the weakest links, exposing them more and more? That I don't know, but it irritates me very much.