Main characters were sadly really boring also the story was nothing fancy.
Junwoo was in my opinion really poorly written.
And they should have given Hwiyoung more depth to his character at the end and also his father.
But the supporting characters were the best part of this show. Their characters gave the show more color. They're the only reason why I completed the show.
Moment at eighteen is for me the lowest rated k-drama. The 5 is for the support characters. I really loved them!