2. Gets declared off-topic.
3. ¯\_(ツ)_/¯
Either way, the DMZ is 400 sq miles largely forested, with about 0 human population density. Maybe its got some leopards, maybe maybe a tiger.
South Korea 507
North Korea 201
New Jersey 470 (densest amont US states)
New York 162
California 97
US average 33
The Korean DMZ is "about 250km long, 4km wide" strip of land sitting between two hostile countries, with hundreds of thousands of soldiers on either side, with barbed wire fences and watch posts running along its length. Thousands of eyes are watching every corner of it right now as I write this.(For comparison, the Yosemite national park is 1,169 square miles, larger than DMZ. Somehow people are sure that it harbors no grizzly bears.)
A tiger isn't a bigfoot. It is an apex predator that roams around huge areas and is scared at nothing. I stand by my assertion: if there's a tiger in DMZ, we'd know.
Yosemite national park has loads of grizzly bears. Also a few million visitors per year to spot the grizzlies and sometimes get killed by them. [http://www.yellowstonepark.com/things-to-do/wildlife/bears/]
I wouldn't bet money on a tiger living there either, but there really aren't many humans walking around most of the DMZ.
There hasn't been a grizzly bear in Yosemite since the 1920s.