The plot is classic: high school lovers (undeclared) who help and support each other; love triangle with the stepbrother? ; separation on a misunderstanding; complicated reunion 5 years later.
Afterwards, everything depends on the way of writing and bringing this story to life...
Well, in this series, not very well written with inconsistencies, we don't live the story.

The flaws:
- treating the phobia of darkness, (played as anxiety, not panic) is not consistent.
- the so-called sick girl, who leaves at night, alone, to escape a too early confession ???
- the separation (accepted by the ML for what plausible reason?) without a word??
- Above all, LF's inability to convey emotions!!

The good sides:
- the ML character (well done) who is funny, cheeky, brave. He is the one who keeps the series standing!
- the secondary characters are well played and relatively well developed.

The OSTs are correct without being memorable.

To conclude, I was not enthusiastic about this series, which I nevertheless watched until the end, with a lot of zapping, so much the FL annoyed me.
I will certainly not rewatch it, and I advise those looking for something captivating, to look for another drama.