There isn't much to talk about this. I have just watched some of the episodes, but I could predict how the show would play out.
The series is as expected of an average TV drama. The plot is easy to understand, and it contains a lot of characters with different storylines. It all started when the main girl's father was arrested for murder, he asked his sworn brother to take care of her, who was a baby at the time and he must keep this a secret. 27 years later, the father got released and try to set up a new life. He stumbled upon his daughter - who's now an adult and also has a fresh start due to certain circumstances. He slowly gets closer to her life (accidentally) and the story shows more about the main girl's life attaching to romance, work and how she and her father reconnect.
The plot is cliché, there are certain character tropes, some scenes gave me second-hand embarrassment, the protagonist's adoptive mother and sister are extremely annoying, I heard they had good ending so why? But on the other hand, the acting is believable (just some of them), I'm surprised that the actress who played the main girl is an idol, since her performance is actually pretty natural. Her father was great as well.
Overall, the series is an above-average show. It's a good recommendation for those beginners who want to enjoy general drama and have plenty of free time in hand.