Ugh! Why so stupid?

At some point in these middle 30s episodes, Cha Soo Young became unbelievably childish, unprofessional and narrow-minded. I understand that pregnancy can affect emotions but this is too much.

The gall of her talking to Han Hye Ryeong about her morals in a rude manner and openly raising her voice like a petty jealous b*tch is way out of character. You don't do that to a company acquaintance especially when you're trying so hard not to blow your cover even if she was your husband's ex!

What's the use of hiding their relationship anyways? I hope she gets to keep her team leader position but if she loses it, that's bull crap.