So I  was reading the comment section in the '5  Things We Hate About Kdramas'  and I was curious if there were any dramas which actually did this -  instead of falling for the douche bag bully of a lead,  the girl falls for the nice,  kind, reliable guy.

Boku to Star no 99 Nichi
Doctors
Jejoonwon

These are family dramas which means they are 50+ episodes:
Golden Bride
Ugly Alert
Reply 1988 
Dream High (at least I think he was nice, it was a long time ago I watched it) 
Weightlifting Fairy Kim Bok Joo
he is the kindest human on earth 
Weightlifting Fairy Kim Bok Joo
One More Happy Ending
Reply 1997
Bubblegum
I Need Romance 3
Orange Days
Last Christmas
Age of Youth too i think 
Weightlifting Fairy Kim Bok Joo 
Reply 1988 
One More Happy Ending 
Smile, You 
Flower Boy Next Door 
Witch's Romance 

Basically any noona romance, at least all the ones that I've seen. 
Besides the other ones already mentioned:
can you hear my heart
my little princess
I can only think of one now, but it's a japanese drama called: I married as a job (or something)
On the Way to the Airport
High School King of Savvy
Ho Gu's Love ! Ho Gu is the cutest ever ;W;