Before starting this drama I was already skeptical about the deserted island setting. I feel it's something that can't really work much as a plot device if the story is set in modern times, and this show didn't prove me wrong.
Mostly we have to take this whole story as pure fantasy, but even in the constraints of plausibility in a fantastical world, here there are things that simply don't work and that are just left as plotholes and the rest is just a collection of unrealistic situations that will make you facepalm very hard or that you'll have to brush off to move on with the story.

I find with this series there is a lack of a focus in the plot. Sure, we have a FL and the plot seems to follow her from the start mostly, only that it gets sidetracked multiple times along the way and ultimately feels like her story line didn't progress much nor it made much the impact it could have. The abusive father of ML is the only constant linear plot line in this show, even though if still with a dose of unrealistic-ness and quite dragged.

The start was good and overall it was so much more interesting and I was more invested in the story line in the beginning. I think this is mostly as well because I thought the young actors did such a better job at the characters than the older ones. I don't understand why it's a constant issue that if someone older plays like they're stuck in their teen years mentally they have to do some weird overacting that it's just immensely cringe. Don't they remember their teen years? This is becoming a new trope I absolutely despise.
What was the point of her being stuck in that island anyway? This is only used as a plot device in a couple of occasions as flashbacks and any other setting could have been used anyway. It's a small part of the plot and I don't think adds anything. She should be so much more mature precisely because of her life experiences in that island but as it's mentioned in the show itself, she's childish like that because she didn't continue her education.... excuse me what?

The love story in this show is quite anticlimactic and the "love triangle" if it can even be called that, it's unnecessary as always.
A lot of the plot points are just like that because the script said so, otherwise they make no sense, like Ki-ho hiding his identity to her knowing she's looking for him, like so much could have been avoided if he had told her straight away and told her the situation and to keep it secret. It's just so silly. Also he goes from that to then wanting her to be famous like all of a sudden he doesn't care anymore.

The biggest middle chunk of the show the attention is mostly on Ran Joo's character more than the FL, to the point the whole premise of her career as a singer is put to the side. At this point I lost most of the interest I still had for the story. Ran Joo's character is not bad but it's not great either and if I was supposed to feel sorry for her I didn't because her situation could be so much worse, especially when compared with the Kang family whose dynamics, by the way, were of the best of the show.

I think overall for a short drama it didn't have a clear idea of what it wanted to focus on, there were multiple subplots and the execution of them was not done in the best way, the story progressed in chunks of focusing on one thing or another what I get why they did it that way but it just added more to the unrealistc-ness of it all. Moreover, some of the characters would also keep changing from one side to the other what would do or undo the plot as it goes. The worst of all of this is that it makes you lose interest as it changes because most plot lines become very dragged as a result. Points for having so many story lines and characters at the same time and somehow still manage to make it boring.
There were a few conversations between characters that were engaging and I shared their sentiments but most of the others were very uninteresting and added nothing to the story or character development.
FL is cringe, ML is background character, couldn't care for Ran Joo, second ML (Woo Hak) has more screen time than the first and yet his personal story goes really nowhere (and he had more chemistry with FL too), and I have no idea why Lee Seo Joon is considered main character, he spent the series going in circles. Kang parents were great and I wish we got more of Mo Rae since she seemed somewhat interesting.

No more amnesia trope PLEASE. I'm so done with it, let's just leave it back in the past where it should remain. It was annoying at the time and it's even more annoying now.
This is also labelled as "comedy" here but I really don't know why, there are zero comedy moments unless people laughs at FL accent and "teen" attitude what it's actually insulting because it perpetuates this idea that certain accents/dialects mean the person is ignorant and dumb, she even somewhat drops it in the last episode, because now she's a *proper singer*... meh.

I debated giving this a 5 because I've seen worse and it had some nice moments, but writing this review and thinking about the series really stopped me. It is watchable if there is nothing else to watch and some of the songs were nice but I generally can't recommend. It doesn't know what it wants to be and manages to do everything half way in a dragged and boring way.