I have always gotten a kick out of watching sword dancing, especially when pretty girl do it. We do not do it much here in the USA. The scots do it as do the cossacks, central asians, and apparently the koreans. It is always more interesting when a pretty girl does it. Here it is in Korea, but the swords look like japanese katanas and not traditional korean swords.

Here is the Japanese version of it. Even if those katanas are dull and not real steel, what they are doing is very dangerous.

Korean swords tend to be thinner, and wider than katanas...
However, it also depended on the sword maker, as some ended up
quite a bit thicker than a katana.

It can be very difficult to tell the two apart until you get within killing range...
the tip of the Korean sword is more of a natural ending unlike the Katana's
Tanto-like tip.

Older Korean swords were a bit easier to differentiate, as they had a nice round
circle at the end of the handle...neat feature

The two incursions into Korea in the 1500's by Japan is probably why the similarity.
When someone chops up your people and takes over your country, ya tend to
make weapons that are at least equal to, or better than in your view,
and matching your fighting style...or at least will defeat the armor you are faced with,
as the Mongol's Boiled Leather was difficult to cut through with the pre-katana
types of swords...and speaking of fighting, and I'm going to commit a wee bit of
Heresy here...TKD ain't very different from Japanese Karate, other than the main
focus of TKD being the kicks, as opposed to Karate's balanced approach of kicks
and strikes, versus Chinese Gung Fu's exorbitant amount of technical hand strikes.
Yes, those are broad generalizations...still true
Ain't even going to get into the grappling arts discussion...lol

There's only so many ways to move the human body, so it's little surprise that
most martial arts do nearly the same thing with only the names of the positions
and strikes being different.

In any case, it's fun as heck to study different arts, then compare them with
each other, discover what works best for You, and Rock On with it!
Also rather important to study other arts to find out their weak points
so that you can use that knowledge against them in a fight...
I.E., for every martial arts school in a community, there's always a couple
scumbags that get competent and then use that knowledge for evil...so it's
wise to know what the most usual attack profiles are so you can counter.

Sword twirling is becoming popular among the cossacks that are being encouraged with the fall of the USSR to rebuild their traditions. These women are pretty good at it.