Underrated:

Time Between Wolf and Dog
Switch Girl
My Bratty Princess
Sad Love Song
Star in my heart.

Overrated:


Coffee Prince
Full House
Personal Taste
Innocent Man
Shut Up Flower Boy Band
Gokusen
Zettai Kareshi
Lie To me
Overrated :
*School 2013
*May Queen
*Missing You
*Sorry I Love You
*Startling By Each Step
*That Winter, The Wind Blows
*The Bridal Mask
*To The Beautiful You
*Flower Boy Next Door


Underrated :
*City Hall
*Fugitive: Plan B
*Ghost
*Inu wo Kau to Iu Koto
*Myung Wol the Spy
*Prosecutor Princess
*Sign
*The Incarnation of Money
*The Woman Who Still Wants to Marry
*Three Dads One Mom
*Foolish Mom
Underrated
The World That They Live In
Lovers
Padam Padam
Orange Days
MARS
Lie To Me (okay, so I get that it's not a perfect drama, but it is NOT as bad as people make it out to be! :)

Overrated
Queen In-Hyuns Man
I Hear Your Voice
Autumn's Concerto
Prosecutor princess, time between dog and wolf and kpop, the ultimate audition are seriously underated. Kpop the ultimate audition was good but not great but prosecutor princess and the time between dog and wolf is way too under rated. Seriously, it seems like people really ignore these dramas even though they're fantastic! If you have not watch them, i strongly reccommend giving them a chance and you wont be dissapointed.
Underrated: MARS Tatta Hitotsu no Koi Overrated: Autumn's Concerto Personal Taste Rooftop Prince Coffee Prince
UNDERRATED: I'm not particular for underrated cause all I'm watching were dramas that many people convinced me to watch so I don't consider them as underrated. OVERRATED: Dream High. That was the drama that I can't believe I stand to finish watching it. The truth is I watched the whole drama because I kept on waiting for good scenes that will convince me that this drama was worth the watch but no it doesn't turned out good for me. It's so overrated.
TheMercurialKnight wrote: These shows haven't gotten the attention they deserve:
The Queen's Classroom - My no.1 no one can shake its place
Little Girl K - Best action/thriller
The King of Dramas - Great
Operation Proposal - Don't understand why people hate it.
Legal High - Funniest

Dramas aren't worth hype:
The Bridal Mask - Most overrated...it's 50/50
Faith - Most overrated
Innocent Man - Was good but...
IRIS - There is my favorite actor and I love action still ultimate boredom...
Missing You - 10/10 start but after that its a (-10)
Boys Before Flower - Most overrated, I almost stopped watching K shows because of this


Updates...

Overrated:
Everything in my dropped list (4+ episodes - Dong Soo) with MDL rating 8+!

Underrated:
BOSS
Once Upon a Time in Saengchori
The Snow Queen
Umareru
Orange Days

Brutally underrated:
Foolish Mom
Alone In Love
Evasive Inquiry Agency
FullDex wrote: Underrated:
MARS
Tatta Hitotsu no Koi

Overrated:
Autumn's Concerto
Personal Taste
Rooftop Prince
Coffee Prince


I definitely agree with MARS being underrated and Autumn's Concerto being grossly overrated! :)
Underrated: Pick The Stars / Stars Falling from the Sky Cheongdamdong Alice 1% of Anything Overrated: Boys Over Flowers Coffee Prince Playful Kiss City Hunter
Not that it's underrated because it got pretty high scores, I just think a lot of people don't know about it: White Christmas overrated: Boys over Flowers and Playful Kiss.
underrated _____ can u hear my heart - golden time overrated _____ playful kiss the worst drama i've ever watched
Under: Can Love Become Money? and Go Mrs Go! Over: Boys Over Flowers...Really???
Underrated Prosecuter Princess Fugitive Plan B Most underrated ever - My country calls/ call of the country
Overrated:
Boys Over Flowers- even though I love the story and watch all the remakes, this one really wasn't that great
The Rose- I love Ella and Joe but that show was just weird. Had to drop it.
Mary Stayed Out All Night- I honestly loved the first few episodes, but about half way through it was a mess.
Stand Up!!- I can tell why so many like it, but for me it was boring.

Underrated: (not sure any of these are rated low but I don't hear or read a lot about them)
Queen of SOP- Great show, strong female lead and a male that didn't try to stomp on that
The King of Dramas- This was such a funny show
Limit- Really good and intense. Makes me think about my high school days, what would I have done?
Underrated: Cain and Abel Que Sera Sera Tree of Heaven Who Are You? (2008) Overrated: Boys Over Flowers Dream High 1+2 You're Beautiful Winter Sonata (I know this is a classic, but i didn't find it very special)