I had a few tiresome days at work and I want to regain my energy with some funny/ comedy dramas. Preferably a series that doesn't turn dramatic later.

I prefer Korean series..other than that :

I don't care if the series are romantic or not.
I don't care about the year of release either.
I don't care about number of episodes or if it has bishounen.

I just want pure enjoyment and lots of laughter.

So, what would you recommend me ?
I just can think of Speedy Scandal & Ghost House (funny K-movies) since you has overloaded list make me said: "WOWWW"
I hope you like those. Enjoy (^_^)v
As for Japanese funny Drama/Movie: Triple Kitchen.
Dorama --> Joudan Ja Nai!
I just took a look at your list & you have seen a lot already...lol......the only funny film I can think of is Kung Fu Hustle - I saw this by chance when a channe lhere were having a "World Cinema" week it made me laugh...its really unusual & a bit wacky so not sure if it will be your cup of tea...also its not Korean I think from memory its Chinese.
Queen of Lunch Time a.k.a Lunch no Joou - very funny.
there are Satoshi Tsumabuki, Yamapi, Eguichi Yosuke, Yamada Takayuki, Misaki Ito & Takeuchi Yuko in that drama.
It's star-studded drama.
I've seen quite a few series and have so many in my to watch list so it was a little hard to decide what to start next..
Plus the fact that I wanted something more "happy"..
Thank you everyone! I'll check the series you recommended.
I'm sure I'll enjoy them! :)
All I can say atm are japanese:

Gachi Baka
Gakko ja Oshierarenai
Attention Please
Abarenbo Mama
and i'm pretty sure you've seen this: My Boss My Hero