Chae-wo n. Kim has written:

'Treasures of Korean art' -- subject(s): Art objects, Korean, Art, Buddhist, Buddhist Art, Korean Art objects, Pottery

Is a korean material art and the national sport of the south korean

It is an South Korean martial art/sport

There is no established Korean Martial Art called "deon."

The closest term I can find to this spelling of "deon" in Korean is 던져 (deon Jye) which means "throw" or 던지기 (deon ji gi) which means "to throw." Therefore, itmight be a technique, and not a Martial Art.

I am not aware of any other such term in Korean by this spelling (perhaps an alternate English spelling would render a different Korean term).

Manga is referred to Japanese comics or print cartoons and is considered by many to be an art form.

However, Korea does have an art style which resembles the art of Manga which is called Manhwa.

Basically, Manga isn't a Korean art; it's a Japanese art. Korea has something close and similar to Manga called Manhwa.