I have not seen any of these shows yet but which are the funniest by ranked in your opinion?

- The Master's Sun

- Age of Youth

- Reply 1988

- Descendants of the Sun

- Reply 1997

- W

- Oh My Ghost

- Angry Mom

- Something About 1 Percent

- Shopping King Louis

- Rooftop Prince

- A Gentleman's Dignity

- Falling for Innocence

- Marriage, Not Dating

- Sassy Go Go

- History of the Salaryman

- Legend of the Blue Sea

- Chief Kim

- Jealousy Incarnate

- Ojakgyo Brothers

- Twenty Again

- My Girlfriend is a Gumiho

- The Greatest Love

- The Lover

- Reply 1994

- Let's Eat

- Emergency Couple

- My Wife’s Having an Affair this Week

- Heart to Heart

- High Kick! The Revenge of the Short Legged

- Lucky Romance

- Beautiful Gong Shim

- Cunning Single Lady

- One More Happy Ending

- Drinking Solo

- My Girl

- Personal Taste

- Protect the Boss

1.Age of Youth
2.Personal Taste
3. Masters Sun
4.Something About 1 percent
5.Falling for Innocence
6. One More Happy Ending
1. My Gumiho 
2. My Girl
3. Personal Taste (lighthearted, but don't highly recommend) 
4. Falling for Innocence (funny in parts, highly recommend) 
5. W (more serious, but very good) 

Other Recommendations:
Strong Woman Do Bong Soon (2017) 
Weightlifting Fairy Kim Bok Joo (2016)

1. Rooftop Prince
2.Falling For Innocence
3. Reply 1988
4. Legend Of the Blue Sea
5. Reply 1994
6. Reply 1997
7.Protect the Boss
8. One More Happy Ending
9.  Master's Son
10.The Greatest Love
11. My Girlfriend Is A Gumiho
12. My Girl
13. W
14. Emergency Couple
15. Personal Taste
16. DOTS
17. Sassy Go Go
- Oh My Ghost
- Marriage, Not Dating (becomes a bit melo midway)
- Shopping King Louis
- Reply 1997
- My Girlfriend is a Gumiho
- Jealousy Incarnate
- Falling for Innocence
- Emergency Couple
- Protect the Boss
- Rooftop Prince
- Reply 1994 (funny but heavy enough to not be a comedy)
- The Master's Sun
- Personal Taste
- Heart to Heart
- The Greatest Love
- My Wife’s Having an Affair this Week

imo this is how they would be ranked laughs wise. quality wise is a bit different :P
1) Reply 1988
2) Legend of The Blue Sea
3) Sassy Go Go
4) Dots
5) W
The rest I haven't watched
1) Let's Eat
2) Oh My Ghost
3) Legend of the Blue Sea
4) Shopping King Louis
5) Chief Kim
6) Sassy Go Go

Don't bother with Drinking Solo, it's painful to watch I dropped it before the couple got together because every character was a horrible human.  I remember wishing they'd drink themselves to death.

Angry Mom isn't really funny.  It has a comedy tag but shouldn't.  There are funny parts but it's really, really dark, however, you should watch it immediately, it's excellent
1. Oh My Ghost 
2. Marriage Not Dating 
3. Reply 1997 
4. Lucky Romance 
5. Rooftop Prince 
6. Protect the Boss 
7.  My Girlfriend is a Gumiho 
8. The Master's Sun 
9. Age of Youth 
10. DOTS 
11. Falling for Innocence 
12. The Greatest Love 
13. My Girl
14. Sassy Go Go
15. Angry Mom
16. W
Im not going to list here all the dramas but i noticed noone listed The Lover in their list.

If you are looking for pure comedy, try one episode of this because i have a feeling that this drama was mainly shot for the purpose of comedy. Yess, there is some underlining story but many scenes feel like TV sketches from SNL and were made with the purpose of making you laugh. However, it needs to be said that this series might not please anyone because the jokes are really.. raw (?) and i can imagine there are plenty of people who will find it unfunny.
I have not ranked my list, because I want to tell what my recommendations are (which I already watched) and I'm on my cellphone, which is somewhat difficult typing.

- The Master's Sun (I dont think this drama belongs in the comedy-genre. I think its more mystery/thriller and romance.)
- Angry Mom (There are some moments which are funny, but its not really a comedy. I recommend this one with how good this drama is!)
- Shopping King Louis (Its has funny moments, but its more sweet, caring between the leads and kinda sad. I would recommend it tho.)
- Sassy Go Go (Its comedy-ish. I had high expectations, but it was different. I liked it, but I wouldnt recommend it.)
- Chief Kim (This is just my opinion, but when I watched the first episodes of this drama, I got a different vibe off then how it 'normally' was filmed. It is filmed in a special way. I think you have to like this and the humor to be able to watch this.)
- Emergency Couple (Its a while ago I watched this drama. But I gave it a 8. It was funny, serious and romantic.)
- Beautiful Gong Shim (A comedy you say? I TOTALLY recommend this one. I love, love, love this drama. The main lead was so funny. With some scenes I hardly dared to eat how funny it was.)
- Cunning Single Lady (I also watched this a long time ago, but I gave it a 9 on MDL.)
- Personal Taste (Its not a drama I would recommend, even though Lee Min Ho is the main lead.)
1. Jealousy Incarnate (very funny throughout!) 
2. Oh My Ghost 
3. My Wife’s Having an Affair this Week
4. Age Of Youth 
5. Marriage not Dating 
The ones I found funny-
1. LOTBS
2. Chief Kim
3. My GF is a Gumiho
4. Shopping King Louie
5. Rooftop Prince
6. The Master's Sun
7. Marriage, Not Dating
8. Beautiful Gong Shim
9. Protect The Boss

Not really funny all the time,but I'd still recommend you watch them-
10. W
11. Sassy Go Go

My GF is a Gumih
Rooftop Prince 
emergency couple 
beautiful gong

I would only pick these 4 as comedy. Others might be good drama but not much comedy in it