A Korean Odyssey: Fun and unique story
Incomplete Life: flowing story and deep life lessons
Goblin: cool lines, original jokes, original and exciting story, I was curious for especially the king and the queen's story
Love in the Moonlight: fun, cute, many touching scenes, one of the very First Kdramas I've watched and it had looked to me as if nobody could write such a beautiful story except its writers
The Crowned Clown: breath taking story, exciting till the end, and there is a boy (main lead) who shines as if he is the sun in the darkness
I have a similar problem but not that severe. If I like a drama too much, I definetely complete but if the drama is good but not that much, even though nothing is wrong, I stop watching sometimes. I guess I want to do something different at those times. This could ve the reason. The above dramas are the ones I rated 10 or 9,5. And I don't rate 10 any drama that easily.