I usually find at least one aspect of a show that detracts from the perfect 10 overall, but not with this show.
From the story, to the acting, to the setting, to the music, this show was the perfect 10, and I couldn't have been happier with it.

Our story is about a girl who's adopted into a rich family from an orphanage at a young age. Unfortunately, she grows up being hated by her evil stepmom and evil stepsister. They abuse her while her father is indifferent to her and her suffering.

Desperate to leave her home, she believes she's found love when she meets and marries her husband.
To her continuing misfortune, after marrying him she learns that he's never loved her at all and only married her in order to be closer to the evil stepsister- the woman he really loves.
On the heels of this devastating realization, three things happen in tandem: her evil stepmom frames her for art theft and embezzlement, her husband asks for a divorce, and she gets into a car crash- which ultimately kills her. As she lays in the hospital succumbing to her injuries she realizes that there is not a single moment in her life that she will miss. Overcome with grief, she makes one dying wish, "let me live so I can do it all over again. I want to really live life."
Her wish is granted and she wakes up safe and sound in her bed- one year in the past.

Determined to live, she seeks revenge on those who abused her.
Step one is to dump her awful husband- who's still her fiancee at this point.
Step two is to marry the man whom her evil stepsister wants to marry - he happens to be the rich, powerful and handsome second son of a chaebol family.
She approaches him with an offer of a convenient marriage, and he agrees to her terms.
Little does she know that her lovely new husband has agreed to marry her for reasons of his own- which have nothing to do with financial gain or revenge.

The story then develops as we see her relationship with her new husband blossom- and she blossoms along with it.
She gains strength from him, and takes some on her own, overcoming her long-lived abuse, finding a warm welcome amongst her friends and her husband's family. Eventually, as secrets come to light, motives are revealed, and the evil ones are unmasked, we get to see her perfect marriage, and her revenge- AKA her happily ever after.

I love how everything comes together so well.
Everyone got what they deserved (with maybe the exception of the FL's dad, but I'll forgive that since the FL chose that for herself and I'll respect that choice for her).
I love how the FL went from 0 to 90 when she went back in time. It must have been hard as hell to overcome a lifetime of abuse and conditioning but she did it well and bravely.
I love how the male lead was always, always, there for her, in ways big and small. We love a devoted ML.

The music was wonderful. The setting was wonderful. The acting was terrific.
Overall 10/10.
Highly recommend it. <3