Particularly and honestly, this is a big no. The biggest problem here was the way the production team tried (and they, indeed, did) to make a long story short. Despite it sounds way too cliche, the plot had a big and strong potential: time travelling and teen years, what else can I ask? But it turned into a bad production and I hate using this word at all.
The dialogues are simple and there's no deepening during story/character development. At some point they're just saying whatever is important with no likelihood. It's pure basic and full of those "hero x villain" archetypes that make the drama seemed to be produced by an amateur team. Despite the cast, that was very underrated by their own characters, none really was "good".
I know "they" got few time to show what they wrote, but there was very very very better ways to present what the team had prepared and the main plot. The direction team didn't show enough to be presented as a "good dorama". At all. We see cliche moments, cliche dialogues, cliche characters and again, without deepening on their developments. The main couple, for example, has no chemistry. And I mean: no chemistry. Not even a little bit.
Of course, if you like those cliche romcoms or just wanna something short to watch... You'll probably like it. But, for me, (someone's very critical, I admit it), it's very bad and I wouldn't watch it again nor recommend it for someone who's above 12 years old.