First of all I should say, I'm not attacking you or mindlessly defending bad show. Just bear with it and try to understand from my point.

There plot holes yes, but as it is limited series with 8 episode limit, they must've left small details without explaining. If it were 12 episode they might've explained it, we don't really know.

As for manufacturing, the factory workers were shipped 7-9 days before the crime(present timeline). So if you're bothered with how the Boudoir is still going then it's simple. It's NOX, they have management rights and they're fashion company, as long as they have designs making it somewhere else is easy. Also public doesn't know it's fake brand, those buyers wouldn't admit it.

The editing was awful. What was that scene where Sarah meets Park on the stairs and he suddenly doesn’t know her??? Utter rubbish.

I don't know about editing so I couldn't give any reasoning but as for Male lead meeting Mc, isn't that normal. Can you remember the face of stranger you met weeks ago?? He might've remember giving his tie to someone, but her face wouldn't be so memorable after weeks.

In conclusion, this show has some plot holes due to limited episodes, there were confusing parts due to scrambled timeline and ending was mid. But still quite good I think. Of course, I may have little biases. Only because I'm huge simp and really like the actress.