I'm looking for a manga/manhwa where the girl or guy has a disease that may or may not be cured. It can be a tragedy or a happy-ending, but I want something that has some drama in it.

Don't Suggest:
Boku no Hatsukoi wo kimi ni Sasagu
Millennium Snow
Mucha Kucha Daisuki
Renri no Eda
Sekai no Chuushin de, Ai wo Sakebu

Why? Because I've read them already.

Shin Angyo Onshi

Socrates in Love is reeeeeaally good :]
i take that back..you already listed :/
i think this thread might help you,but its more on the comedy side:
http://www.mania.com/aodvb/showthread.php?t=91574

Here's a good thread.

"I've seen a look in dogs' eyes, a quickly vanishing look of amazed contempt, and I am convinced that basically dogs think humans are nuts." -John Steinbeck

Quote from sefinalishehalif

Here's a good thread.

Thanks, but I already checked it out 🙂

Full Moon Wo Sagashite

Isn't exactly about sickness but ya may like Made in heaven.

Hanbun no Tsuki ga Noboru Sora
It's also a short 6 episode anime.

Main Girl afflicted with Disease.

Trip Fall Die

GAH! My plot doesn't bend that way!

Sweet Medicine

Quote from amaranthine

Sweet Medicine

Aww...I liked this one. I just read it a few days ago ^.^

Ibara no Ou All the main characters are sick

Quote from XxKumagoroXx

Full Moon Wo Sagashite

Haven't read the manga, but the anime is definitely recommended. Lovely music in it as well to enhance the story 😃

This life sucked. Where's the reset button?
Ni carú quelórë

Quote from Aenonar

Quote from XxKumagoroXx

Full Moon Wo Sagashite

Haven't read the manga, but the anime is definitely recommended. Lovely music in it as well to enhance the story 😃

Yea...I watched the anime a year ago and liked it.
I didn't bother reading the manga, though.

Second Ibara no Ou
I also recommend Double Arts but this might be not exactly what you are looking for.

Top 3 favorite manga right now:
3. Ao no Futsumashi
2. Wolf Guy

1. Ubel Blatt
   !!!!!

Hitsuji no Uta