So the show starts out actually quite good for the first 7-8 episodes. The actors are pretty good, the music is decent, and the story is pretty entertaining.

Then around episode 8 it starts to show Problems. The lead ouple are both starting to treat the companie constantly like a playground. It worked before as it was mainly the FL goofing off, but more and more the entire company becomes a circus. On top of that the two Big initial plot 'secrets' start to drag on far to long. But still enjoyable enough at that point.

Around episode 12-13 stuff really goes bad. The siblings of both Main Leads are increasingly going out of their way in order to intentionaly hurt the main couple, even though their beef is with the Grandfather. And the main lead just becomes so bad at keeping the secret that I wondering for a bit if they went crazy and were trying to set up an actuall mental illnes plot.
SPOILERS!!
The FL plans to tel the ML about her sister. Her sister asks her for 1 more month, she agrees. Then when that comes rolling around, the FL meets the ML to explain. Before she can, Grandfather bursts in with a photo of ML/FL brother/sister, and acuses FL of cheating on ML. Instead of simply giving the explanation she had already PLANNED TO GIVE ANYWAYS, she stays queit under repeated questions, then proclaims she can't explain stuff at that time.
I tried to hang on to see if they'd turn it around with increasing skipping of scenes, but had to drop it by the end of episode 17. Ususaly I'd skipp a lot of scenes or episodes till the end with a show that goes bad simply to see how it turns out. But i didn't do that for this show when I found that there wasn't a single important character that i was hopjng would get any kind of happy end. Quite the oposite in fact.

TL;DR: the actors did an admirable job with what they were given, and I wish the writers a happy life. But by god i hope no one let's these writers touch a script ever again in their entire life. This is not simply a bad script, this so far holds the crown (together with the ML from that vinyard inheritance drama) of the worst, most despicable and unlikable Main character (FL from this) i have ever seen.