Good story is stretched to a not good story

I rated 1st 5 episodes 5♦ , 2nd 5 episodes Mood Swing, and 3rd 4 episodes Little Goods with a bunch of bad 'yuck' goods.
Don't say about full of lovey-dovey romantic idol life, no extra expression.

I think, this drama can be compressed into 12 episodes which may be more of a good drama like Park Shin Hye's drama like DOCTORS, Heartstrings.