As others have mentioned, the series started off with an interesting premise and I enjoyed the first 4-5 episodes. Then, it became clear that the story was really about her first life, which wasn't particularly interesting. The same poorly lit/shot/designed scenes from her first life were repeated over and over again.

Spoilers follow: While one must throw logic and reason out the window when considering the premise of many kdramas, I had to question what the likelihood was that most all of the leads in the show were also in her first life. And they were also all at the same ages as they are in their current life. Which leads me to the biggest headscratcher of the series: When she finally unties herself from her past life and subsequently forgets about them, how is it that she also forgets about the relationships that she has built in her current life? Yet everyone else can remember them. She eats kimchi as Kim Ae-Gyeong's restaurant--where she supposedly had lived throughout her teens--and can't remember it? However, she ended up being the same senior engineer? Huge plot hole.

I'm guessing that the writer(s) was willing to overlook this due to their desire to set up the finally scene at the hotel swimming pool. As if none of the people who knew about her prior lives are not going to tell her about them anyway?

Still scratching my head.