Gu Family Book and Queen Inhyun's Man for crying... And that was 3 years ago almost when I watched them. o.o I'm not a very emotional person anymore that's why nothing can really trigger my deep emotions like actually crying or laughing intensely hard in dramas. I've definitely had teary moments (teared my whole way through episode 12 of Cheese in the Trap rewatching it just Saturday) but really crying with sniffling and to the point of needing to blow my nose it's been years! I'm highly introverted so if you see me on my laptop watching a drama my face will probably be like -_- but if I'm alone I'll laugh and make comments. XD 

Today watching Cheese in the Trap was an adventure though. I'm used to internet flowing easily and if I get interruptions it's usually people. 
But oh my... I just wanted to die. My player would pause for 20 seconds, play for 4 seconds, pause for 3 minutes, play for 5 minutes, pause for 30 seconds, play 2 seconds, and keep doing that I just... -_- I cried so much and punched so many pillows waiting for it to load. Hahahaha I'm not sure if that counts as the drama leaving me with the most emotions if I wasn't currently watching when I got the emotions... But I was pretty emotional waiting between plays. XD  

Definately drama "I am Sorry I love You" starring by so ji sub. This drama really make my emotion going crazy. 
@Sony - CITT is a serious culprit at messing with emotions! I am absolutely the same when watching that. :) I can imagine your pain when the player kept pausing/stopping - what player are you using? Dramafever can sometimes be really frustrating as occasionally it just won't work for no reason!
I Remember You 
I Hear Your Voice
The King 2 Hearts

I was just speechless over these three dramas.. They all made me cry buckets. I felt the pain and heartbreak of the characters to the point that I want to go inside my laptop screen and just comfort them </3

Right now, I'm currently watching Signal, and it's leaving me with so much heartache but it's still not over so I'm not going to list it yet.

Missing you and Shining inheritance, I cried almost every episode,  I get emotionally involved with fictional characters, am ready to cry just thinking about the dramas.
peace out
The Bridal Mask. I still feel the feels today.
you who came from the star (perfect chemistry)
queen in hyun's man (found out they started dating in real life!!!!!! *heart eyes emojis*)
rooftop prince (ending got me all emotional)
splash splash love :3
Wow, there have been so many but the ones that come to mind are probably City Hunter, the Healer, Nice Guy, Gu family book, Blood. six flying dragons, the moon that embraces the sun, Baker King Kim Tak Goo. 
It's Okay, That's Love..... I didn't expect anything happening the first time I watched so I was really STABBED IN MY HEART WITH FEELS. I cried so much watching the drama. 
Cheese In The Trap.... I watched it while it was still airing and oh boy did it mess me up every week.
Signal..... I felt so many emotions while watching this drama from start to finish. It overwhelmed me with the glorious writing and acting. I avoided the last two episodes for weeks because I couldn't bring myself to see a particular character's face because I would tear-up. The drama left me with pain and tears.
Cruel City.... This drama just straight up emotionally stabbed me with a knife and removed it and left me bleeding. 

Sassy go go also made me cry because Ha Joon. I have an emotional attachment to gummy bears thanks to that drama. 
It's Okay That's Love :)
this drama is the most memorable one for me! because it gives me deep impression, and after i finished this series, i feel like something big is missing. 
what i love the most from IOTL: the characters (every characters in this series have flaws, but the interesting one is how they can deal with it), the chemistry (top-notched!), nd relationship within the family..such a heartwarming drama :)
cheese in the trap, reply 1988...
the endings...the endings did not meet my needs. I needed them to meet or something and Reply 1988..the hot making out sessions happened on the last episodes and we did not even see them break it to their parents that they were dating. I would have really loved to see that drama go down. 
but recently the drama that has left me feeling emotional, i gotta say was Six Flying dragons. Bang Won ...won (lol) and i was team Bang Won but it left me with a bad aftertaste. 
Gegege No Nyobo - Asadoras are great to experience a variety of emotions, I smiled, I cried, I laughed, felt sorry and hopeful and smiled again
Misaeng - I felt mostly in shock while watching the drama. I was amazed, being such a peaceful person, how I wanted to "murder" some of the characters
Soredemo, Ikite Yuku - pure emotional roller coaster
It's Okay That's Love, Shut Up Flower Boy Band, the beginning of Missing You (while they are young in the beginning), God's Gift-14 days, First half of Reply 1988, Beginning of Wild Chives and Soybean Soup (again with the younger cast in the beginning), Sensory Couple, Reply 1997, Page Turner, Splash Splash Love, Liar Game, I Hear Your Voice, Healer, Because It's The First Time, and Bad Guys. Also Dream High was my first kdrama and I remember being so excited to watch every new episode. 
I cry a lot while watching many dramas but I cried a bucket loads with these;
Scarlet Heart
Tonbi
Ugly Alert
Reply 1997