It's quite nice and well done. I prefer the story this way to the webtoon because at least the sister problem has a better ending rather than being dismissed as Aejin's hallucination. But I wish that Mijin could get more punishment for what she did rather than getting splashed with hot water.

For the music, I have no memory of it. It's not memorable at all.
For rewatch value, I rarely rewatch anything. I rather have a new drama to watch than keep rewatching the old one.
For the acting, it's okay. Bomin's acting is quite good. I don't know him as an idol, but he convinced me with his acting.