It's actually well-written and the mystery side of it satisfied me. I always loved thriller/mystery genre. It's been a while since I watched a series in full.
The thing that I love about this show is it deviated from the typical plot wherein the major issue is only affair. Here, there's more to it than just that. I also love how unfazed FL looks and still stayed collected which makes her look so cool. Even the mistress recognized how the husband won't be a good father despite desiring to have one. I was surprised that the mistress actually apologized in the end despite her stuck up attitude. Her last dialogue with the FL felt more satisfying than the typical snarky, fighting over an incompetent man conversation like the usual dramas.
I really really love main characters who are composed and are not boisterous and all talk. The FL here is actually competent and I love how they legit showed music performances and not just zoom in the face and call it a day.